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Message boards : Problems and Help : Can't figure out why CPU isn't being used 100%

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Profile Jordan Romaidis
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Joined: 11 May 17
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ID: 880615
Credit: 689,813,365
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Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 2 primes in the 2020 Tour de PrimesFound 1 mega prime in the 2020 Tour de PrimesFound 1 prime in the 2020 Tour de Primes Mountain StageFound 1 mega prime in the 2020 Tour de Primes Mountain StageFound 1 prime in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,014,730)Cullen LLR Ruby: Earned 2,000,000 credits (2,080,460)ESP LLR Gold: Earned 500,000 credits (502,325)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,000,054)PPS LLR Emerald: Earned 50,000,000 credits (98,884,636)PSP LLR Silver: Earned 100,000 credits (209,095)SoB LLR Sapphire: Earned 20,000,000 credits (40,278,369)SR5 LLR Jade: Earned 10,000,000 credits (17,734,011)SGS LLR Jade: Earned 10,000,000 credits (19,196,142)TRP LLR Gold: Earned 500,000 credits (691,677)Woodall LLR Jade: Earned 10,000,000 credits (15,028,246)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,084,376)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,606,749)PPS Sieve Sapphire: Earned 20,000,000 credits (23,323,949)AP 26/27 Double Silver: Earned 200,000,000 credits (233,321,530)WW Ruby: Earned 2,000,000 credits (2,340,000)GFN Double Bronze: Earned 100,000,000 credits (150,505,353)PSA Emerald: Earned 50,000,000 credits (53,011,665)
Message 147335 - Posted: 3 Jan 2021 | 22:04:41 UTC
Last modified: 3 Jan 2021 | 22:05:22 UTC

Windows 10x64 latest update
Latest Boinc
No AppConfig all stock PrimeGrid settings

I have a spare i5 4-core that is having a strange issue. It's only using half of my CPU. I have multi-core / threading turned off but its still shows 4 tasks using 46% of my CPU.

I tried setting each task affinity per core too and that did not fix the issue.

Here is a screen shot:

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Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 1 prime in the 2021 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (10,011,570)Cullen LLR Jade: Earned 10,000,000 credits (10,009,374)ESP LLR Jade: Earned 10,000,000 credits (10,009,221)Generalized Cullen/Woodall LLR Jade: Earned 10,000,000 credits (10,012,217)PPS LLR Jade: Earned 10,000,000 credits (16,262,050)PSP LLR Jade: Earned 10,000,000 credits (10,044,081)SoB LLR Jade: Earned 10,000,000 credits (10,064,750)SR5 LLR Jade: Earned 10,000,000 credits (10,002,051)SGS LLR Jade: Earned 10,000,000 credits (10,001,295)TRP LLR Jade: Earned 10,000,000 credits (10,002,411)Woodall LLR Jade: Earned 10,000,000 credits (10,013,921)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,004,228)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,047,667)PPS Sieve Sapphire: Earned 20,000,000 credits (20,866,490)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,043,271)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,015,177)AP 26/27 Sapphire: Earned 20,000,000 credits (20,045,194)WW Jade: Earned 10,000,000 credits (13,668,000)GFN Emerald: Earned 50,000,000 credits (55,355,287)PSA Double Silver: Earned 200,000,000 credits (200,301,443)
Message 147340 - Posted: 4 Jan 2021 | 10:08:52 UTC

It's something strange. I've never encountered such behavior before.

Another strange thing is that Windows says "Speed - 1.34 GHz" although CPU should run at 2.90 GHz on full load.

Did you checked CPU core temperature? There are lot of small freeware utilities, like SpeedFan. May be CPU is overheating and heavily thermal throttled. Theoretically, OS also may do some throttling - for example, modern Linux distributions will automatically insert idle CPU cycles if core temperature exceeds 80C.

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Discovered 2 mega primes321 LLR Jade: Earned 10,000,000 credits (12,924,181)Cullen LLR Turquoise: Earned 5,000,000 credits (5,837,403)ESP LLR Turquoise: Earned 5,000,000 credits (5,453,092)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,474,599)PPS LLR Jade: Earned 10,000,000 credits (13,001,295)PSP LLR Turquoise: Earned 5,000,000 credits (6,084,153)SoB LLR Jade: Earned 10,000,000 credits (19,735,682)SR5 LLR Ruby: Earned 2,000,000 credits (3,158,684)SGS LLR Ruby: Earned 2,000,000 credits (3,121,612)TRP LLR Turquoise: Earned 5,000,000 credits (7,922,107)Woodall LLR Turquoise: Earned 5,000,000 credits (5,099,498)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,834,160)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (2,647,915)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (11,373,349)PPS Sieve Double Silver: Earned 200,000,000 credits (217,760,089)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (4,080,038)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,803,337)AP 26/27 Double Bronze: Earned 100,000,000 credits (110,115,148)WW Double Silver: Earned 200,000,000 credits (211,560,000)GFN Double Silver: Earned 200,000,000 credits (301,555,072)PSA Double Amethyst: Earned 1,000,000,000 credits (1,863,010,550)
Message 147343 - Posted: 4 Jan 2021 | 12:11:14 UTC

Each MEGA task uses 2 MB L3 cache. Since you're running 4 MEGA tasks, that's 8 MB of L3 demand.
You only have 6 MB of L3 available. You're thrashing your L3 cache. That means every MEGA
memory access has to wait for a read of RAM memory (very slow vs. L3 cache).
Your MEGA data never has a chance to be reused from L3 cache before
it's knocked out of L3 cache by another MEGA data access.

That means you shouldn't run more than 1 MEGA with 4 threads (CPUs),
or 2 MEGAs with 2 threads (CPUs) each. By doing this, your CPUs will be
close to 100% and you'll do at least twice as many MEGA tasks per day.

Since you're running other things (which use L3 too), I'd recommend 1 MEGA with 4 threads.
If you weren't running other things, 2 MEGAs with 2 threads might be slightly faster.
____________

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Discovered 1 mega primeFound 3 primes in the 2021 Tour de Primes321 LLR Amethyst: Earned 1,000,000 credits (1,055,580)Cullen LLR Amethyst: Earned 1,000,000 credits (1,486,352)ESP LLR Amethyst: Earned 1,000,000 credits (1,456,500)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,036,242)PPS LLR Jade: Earned 10,000,000 credits (19,685,888)PSP LLR Amethyst: Earned 1,000,000 credits (1,431,623)SoB LLR Turquoise: Earned 5,000,000 credits (6,404,751)SR5 LLR Amethyst: Earned 1,000,000 credits (1,099,239)SGS LLR Amethyst: Earned 1,000,000 credits (1,641,245)TRP LLR Amethyst: Earned 1,000,000 credits (1,067,666)Woodall LLR Amethyst: Earned 1,000,000 credits (1,832,484)321 Sieve (suspended) Silver: Earned 100,000 credits (390,326)Generalized Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (172,076)PPS Sieve Double Bronze: Earned 100,000,000 credits (131,168,981)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Silver: Earned 100,000 credits (154,672)TRP Sieve (suspended) Gold: Earned 500,000 credits (521,056)AP 26/27 Jade: Earned 10,000,000 credits (10,956,530)WW Emerald: Earned 50,000,000 credits (63,640,000)GFN Jade: Earned 10,000,000 credits (19,645,449)
Message 147346 - Posted: 4 Jan 2021 | 12:40:32 UTC - in response to Message 147343.

That means you shouldn't run more than 1 MEGA with 4 threads (CPUs),
or 2 MEGAs with 2 threads (CPUs) each. By doing this, your CPUs will be
close to 100% and you'll do at least twice as many MEGA tasks per day.

Since you're running other things (which use L3 too), I'd recommend 1 MEGA with 4 threads.
If you weren't running other things, 2 MEGAs with 2 threads might be slightly faster.


While this is generally good advice for most other CPU apps, I don't believe GFN supports multithreading (except for GFN-21).

Profile Michael GoetzProject donor
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Ruby: Earned 2,000,000 credits (4,934,619)ESP LLR Turquoise: Earned 5,000,000 credits (5,287,714)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Sapphire: Earned 20,000,000 credits (20,751,038)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (3,718,606)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,963,361)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,118,303)WW Sapphire: Earned 20,000,000 credits (31,412,000)GFN Emerald: Earned 50,000,000 credits (77,916,132)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 147347 - Posted: 4 Jan 2021 | 12:55:15 UTC - in response to Message 147343.

Each MEGA task uses 2 MB L3 cache. Since you're running 4 MEGA tasks, that's 8 MB of L3 demand.
You only have 6 MB of L3 available. You're thrashing your L3 cache. That means every MEGA
memory access has to wait for a read of RAM memory (very slow vs. L3 cache).
Your MEGA data never has a chance to be reused from L3 cache before
it's knocked out of L3 cache by another MEGA data access.

That means you shouldn't run more than 1 MEGA with 4 threads (CPUs),
or 2 MEGAs with 2 threads (CPUs) each. By doing this, your CPUs will be
close to 100% and you'll do at least twice as many MEGA tasks per day.

Since you're running other things (which use L3 too), I'd recommend 1 MEGA with 4 threads.
If you weren't running other things, 2 MEGAs with 2 threads might be slightly faster.


This is all true, but it is off-topic and doesn’t answer his question. Cache misses are too low level a concept to be reflected in the Windows Task Manager. It does not explain why he’s seeing only 50% utilization.

TThrottle and similar utilities/tools/features could cause this, however. A clue here is the very low clock speed. The device is likely overheating, and something may be idling the CPU in order to keep the temperature down.
____________
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Profile Michael GoetzProject donor
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Ruby: Earned 2,000,000 credits (4,934,619)ESP LLR Turquoise: Earned 5,000,000 credits (5,287,714)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Sapphire: Earned 20,000,000 credits (20,751,038)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (3,718,606)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,963,361)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,118,303)WW Sapphire: Earned 20,000,000 credits (31,412,000)GFN Emerald: Earned 50,000,000 credits (77,916,132)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 147348 - Posted: 4 Jan 2021 | 12:58:14 UTC - in response to Message 147346.

That means you shouldn't run more than 1 MEGA with 4 threads (CPUs),
or 2 MEGAs with 2 threads (CPUs) each. By doing this, your CPUs will be
close to 100% and you'll do at least twice as many MEGA tasks per day.

Since you're running other things (which use L3 too), I'd recommend 1 MEGA with 4 threads.
If you weren't running other things, 2 MEGAs with 2 threads might be slightly faster.


While this is generally good advice for most other CPU apps, I don't believe GFN supports multithreading (except for GFN-21).


He is running PPS-MEGA on the CPU.
____________
My lucky number is 75898524288+1

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Discovered 2 mega primes321 LLR Jade: Earned 10,000,000 credits (12,924,181)Cullen LLR Turquoise: Earned 5,000,000 credits (5,837,403)ESP LLR Turquoise: Earned 5,000,000 credits (5,453,092)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,474,599)PPS LLR Jade: Earned 10,000,000 credits (13,001,295)PSP LLR Turquoise: Earned 5,000,000 credits (6,084,153)SoB LLR Jade: Earned 10,000,000 credits (19,735,682)SR5 LLR Ruby: Earned 2,000,000 credits (3,158,684)SGS LLR Ruby: Earned 2,000,000 credits (3,121,612)TRP LLR Turquoise: Earned 5,000,000 credits (7,922,107)Woodall LLR Turquoise: Earned 5,000,000 credits (5,099,498)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,834,160)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (2,647,915)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (11,373,349)PPS Sieve Double Silver: Earned 200,000,000 credits (217,760,089)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (4,080,038)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,803,337)AP 26/27 Double Bronze: Earned 100,000,000 credits (110,115,148)WW Double Silver: Earned 200,000,000 credits (211,560,000)GFN Double Silver: Earned 200,000,000 credits (301,555,072)PSA Double Amethyst: Earned 1,000,000,000 credits (1,863,010,550)
Message 147350 - Posted: 4 Jan 2021 | 13:23:28 UTC

I recommend app "Core Temp" for tracking your CPU temps.
____________

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Discovered the World's First base 116 Generalized Cullen prime!!!Discovered 28 mega primesEliminated 7 conjecture "k"sDiscovered 1 Sophie Germain pairDiscovered 2 Fermat divisors2012 Tour de Primes highest prime count2012 Tour de Primes most Mountain Stage primes2015 Tour de Primes highest prime count2016 Tour de Primes highest prime countFound 23 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 2 primes in the 2018 Tour de Primes Mountain Stage2019 Tour de Primes highest prime countFound 22 primes in the 2019 Tour de Primes2020 Tour de Primes highest prime scoreFound 21 primes in the 2020 Tour de PrimesFound 4 mega primes in the 2020 Tour de PrimesFound 8 primes in the 2021 Tour de PrimesFound 1 mega prime in the 2021 Tour de Primes321 LLR Double Silver: Earned 200,000,000 credits (201,403,028)Cullen LLR Double Silver: Earned 200,000,000 credits (201,409,561)ESP LLR Double Silver: Earned 200,000,000 credits (206,209,602)Generalized Cullen/Woodall LLR Double Bronze: Earned 100,000,000 credits (109,580,172)PPS LLR Double Gold: Earned 500,000,000 credits (728,304,877)PSP LLR Double Bronze: Earned 100,000,000 credits (126,982,721)SoB LLR Double Silver: Earned 200,000,000 credits (207,028,068)SR5 LLR Double Silver: Earned 200,000,000 credits (214,437,634)SGS LLR Double Silver: Earned 200,000,000 credits (203,147,663)TPS LLR (retired) Silver: Earned 100,000 credits (235,439)TRP LLR Double Silver: Earned 200,000,000 credits (201,215,056)Woodall LLR Double Bronze: Earned 100,000,000 credits (151,424,657)321 Sieve (suspended) Double Silver: Earned 200,000,000 credits (235,451,253)Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (83,794,448)Generalized Cullen/Woodall Sieve (suspended) Double Silver: Earned 200,000,000 credits (285,139,652)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (2,728,960,220)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Double Silver: Earned 200,000,000 credits (203,523,358)TRP Sieve (suspended) Double Silver: Earned 200,000,000 credits (201,489,157)AP 26/27 Double Silver: Earned 200,000,000 credits (385,720,907)WW Double Amethyst: Earned 1,000,000,000 credits (1,466,576,000)GFN Double Ruby: Earned 2,000,000,000 credits (2,083,247,712)PSA Double Silver: Earned 200,000,000 credits (259,058,048)
Message 147351 - Posted: 4 Jan 2021 | 13:27:50 UTC

If the temperature reading on the GTX 980 (64C) is anywhere close to correct, then heating is unlikely to be the culprit here.

First thing I would look at is the power settings in the control panel. Win 10 updates have been known to reset these into a power reduced mode when an "s" chip is detected by the OS during the update. Make sure it is on the performance setting.

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Discovered 2 mega primesFound 4 primes in the 2021 Tour de PrimesFound 2 mega primes in the 2021 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (10,011,712)Cullen LLR Jade: Earned 10,000,000 credits (10,025,728)ESP LLR Jade: Earned 10,000,000 credits (10,176,490)Generalized Cullen/Woodall LLR Jade: Earned 10,000,000 credits (10,020,580)PPS LLR Sapphire: Earned 20,000,000 credits (20,184,298)PSP LLR Jade: Earned 10,000,000 credits (10,055,994)SoB LLR Sapphire: Earned 20,000,000 credits (23,135,896)SR5 LLR Jade: Earned 10,000,000 credits (10,885,368)SGS LLR Jade: Earned 10,000,000 credits (10,007,143)TRP LLR Jade: Earned 10,000,000 credits (10,009,531)Woodall LLR Jade: Earned 10,000,000 credits (10,039,527)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,019,388)Cullen/Woodall Sieve (suspended) Double Silver: Earned 200,000,000 credits (265,102,350)PPS Sieve Double Gold: Earned 500,000,000 credits (547,992,812)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,801,812)AP 26/27 Emerald: Earned 50,000,000 credits (93,546,934)WW Double Gold: Earned 500,000,000 credits (559,752,000)GFN Double Silver: Earned 200,000,000 credits (342,641,437)
Message 147352 - Posted: 4 Jan 2021 | 15:16:42 UTC - in response to Message 147351.

If the temperature reading on the GTX 980 (64C) is anywhere close to correct, then heating is unlikely to be the culprit here.


why? cpu and gpu temps aren't linked.

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Discovered the World's First base 116 Generalized Cullen prime!!!Discovered 28 mega primesEliminated 7 conjecture "k"sDiscovered 1 Sophie Germain pairDiscovered 2 Fermat divisors2012 Tour de Primes highest prime count2012 Tour de Primes most Mountain Stage primes2015 Tour de Primes highest prime count2016 Tour de Primes highest prime countFound 23 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 2 primes in the 2018 Tour de Primes Mountain Stage2019 Tour de Primes highest prime countFound 22 primes in the 2019 Tour de Primes2020 Tour de Primes highest prime scoreFound 21 primes in the 2020 Tour de PrimesFound 4 mega primes in the 2020 Tour de PrimesFound 8 primes in the 2021 Tour de PrimesFound 1 mega prime in the 2021 Tour de Primes321 LLR Double Silver: Earned 200,000,000 credits (201,403,028)Cullen LLR Double Silver: Earned 200,000,000 credits (201,409,561)ESP LLR Double Silver: Earned 200,000,000 credits (206,209,602)Generalized Cullen/Woodall LLR Double Bronze: Earned 100,000,000 credits (109,580,172)PPS LLR Double Gold: Earned 500,000,000 credits (728,304,877)PSP LLR Double Bronze: Earned 100,000,000 credits (126,982,721)SoB LLR Double Silver: Earned 200,000,000 credits (207,028,068)SR5 LLR Double Silver: Earned 200,000,000 credits (214,437,634)SGS LLR Double Silver: Earned 200,000,000 credits (203,147,663)TPS LLR (retired) Silver: Earned 100,000 credits (235,439)TRP LLR Double Silver: Earned 200,000,000 credits (201,215,056)Woodall LLR Double Bronze: Earned 100,000,000 credits (151,424,657)321 Sieve (suspended) Double Silver: Earned 200,000,000 credits (235,451,253)Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (83,794,448)Generalized Cullen/Woodall Sieve (suspended) Double Silver: Earned 200,000,000 credits (285,139,652)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (2,728,960,220)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Double Silver: Earned 200,000,000 credits (203,523,358)TRP Sieve (suspended) Double Silver: Earned 200,000,000 credits (201,489,157)AP 26/27 Double Silver: Earned 200,000,000 credits (385,720,907)WW Double Amethyst: Earned 1,000,000,000 credits (1,466,576,000)GFN Double Ruby: Earned 2,000,000,000 credits (2,083,247,712)PSA Double Silver: Earned 200,000,000 credits (259,058,048)
Message 147354 - Posted: 4 Jan 2021 | 17:22:51 UTC - in response to Message 147352.

If the temperature reading on the GTX 980 (64C) is anywhere close to correct, then heating is unlikely to be the culprit here.


why? cpu and gpu temps aren't linked.


An overheating CPU tends to stress the system and tick up heat everywhere. 64C is fairly cool on a crunching GTX 980 in general, and especially in a dual-GPU set up. An overheating CPU should raise the ambient temps enough to push that GPU over 70C when it is crunching GFN.

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Credit: 506,779,696
RAC: 82,905
Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 1 prime in the 2021 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (10,011,570)Cullen LLR Jade: Earned 10,000,000 credits (10,009,374)ESP LLR Jade: Earned 10,000,000 credits (10,009,221)Generalized Cullen/Woodall LLR Jade: Earned 10,000,000 credits (10,012,217)PPS LLR Jade: Earned 10,000,000 credits (16,262,050)PSP LLR Jade: Earned 10,000,000 credits (10,044,081)SoB LLR Jade: Earned 10,000,000 credits (10,064,750)SR5 LLR Jade: Earned 10,000,000 credits (10,002,051)SGS LLR Jade: Earned 10,000,000 credits (10,001,295)TRP LLR Jade: Earned 10,000,000 credits (10,002,411)Woodall LLR Jade: Earned 10,000,000 credits (10,013,921)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,004,228)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,047,667)PPS Sieve Sapphire: Earned 20,000,000 credits (20,866,490)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,043,271)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,015,177)AP 26/27 Sapphire: Earned 20,000,000 credits (20,045,194)WW Jade: Earned 10,000,000 credits (13,668,000)GFN Emerald: Earned 50,000,000 credits (55,355,287)PSA Double Silver: Earned 200,000,000 credits (200,301,443)
Message 147355 - Posted: 4 Jan 2021 | 17:46:10 UTC - in response to Message 147354.

If the temperature reading on the GTX 980 (64C) is anywhere close to correct, then heating is unlikely to be the culprit here.


why? cpu and gpu temps aren't linked.


An overheating CPU tends to stress the system and tick up heat everywhere. 64C is fairly cool on a crunching GTX 980 in general, and especially in a dual-GPU set up. An overheating CPU should raise the ambient temps enough to push that GPU over 70C when it is crunching GFN.


A fan/radiator which fall down from CPU is a simplest example when CPU will be immediately exposed to huge local overheating and throttled down, not affecting rest of the system. An improperly mounted radiator (e.g. with one mounting leg broken, or mounted awry - without contact with CPU cover) will lead to same effect.

Profile Jordan Romaidis
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Joined: 11 May 17
Posts: 255
ID: 880615
Credit: 689,813,365
RAC: 251,606
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 2 primes in the 2020 Tour de PrimesFound 1 mega prime in the 2020 Tour de PrimesFound 1 prime in the 2020 Tour de Primes Mountain StageFound 1 mega prime in the 2020 Tour de Primes Mountain StageFound 1 prime in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,014,730)Cullen LLR Ruby: Earned 2,000,000 credits (2,080,460)ESP LLR Gold: Earned 500,000 credits (502,325)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,000,054)PPS LLR Emerald: Earned 50,000,000 credits (98,884,636)PSP LLR Silver: Earned 100,000 credits (209,095)SoB LLR Sapphire: Earned 20,000,000 credits (40,278,369)SR5 LLR Jade: Earned 10,000,000 credits (17,734,011)SGS LLR Jade: Earned 10,000,000 credits (19,196,142)TRP LLR Gold: Earned 500,000 credits (691,677)Woodall LLR Jade: Earned 10,000,000 credits (15,028,246)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,084,376)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,606,749)PPS Sieve Sapphire: Earned 20,000,000 credits (23,323,949)AP 26/27 Double Silver: Earned 200,000,000 credits (233,321,530)WW Ruby: Earned 2,000,000 credits (2,340,000)GFN Double Bronze: Earned 100,000,000 credits (150,505,353)PSA Emerald: Earned 50,000,000 credits (53,011,665)
Message 147357 - Posted: 4 Jan 2021 | 18:12:34 UTC

Thank you for the suggestions everyone. I'm going to tears down the system clean it and re-apply thermal paste within the next couple of days. I'll report back.

Profile Jordan Romaidis
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Joined: 11 May 17
Posts: 255
ID: 880615
Credit: 689,813,365
RAC: 251,606
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 2 primes in the 2020 Tour de PrimesFound 1 mega prime in the 2020 Tour de PrimesFound 1 prime in the 2020 Tour de Primes Mountain StageFound 1 mega prime in the 2020 Tour de Primes Mountain StageFound 1 prime in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,014,730)Cullen LLR Ruby: Earned 2,000,000 credits (2,080,460)ESP LLR Gold: Earned 500,000 credits (502,325)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,000,054)PPS LLR Emerald: Earned 50,000,000 credits (98,884,636)PSP LLR Silver: Earned 100,000 credits (209,095)SoB LLR Sapphire: Earned 20,000,000 credits (40,278,369)SR5 LLR Jade: Earned 10,000,000 credits (17,734,011)SGS LLR Jade: Earned 10,000,000 credits (19,196,142)TRP LLR Gold: Earned 500,000 credits (691,677)Woodall LLR Jade: Earned 10,000,000 credits (15,028,246)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,084,376)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,606,749)PPS Sieve Sapphire: Earned 20,000,000 credits (23,323,949)AP 26/27 Double Silver: Earned 200,000,000 credits (233,321,530)WW Ruby: Earned 2,000,000 credits (2,340,000)GFN Double Bronze: Earned 100,000,000 credits (150,505,353)PSA Emerald: Earned 50,000,000 credits (53,011,665)
Message 147429 - Posted: 8 Jan 2021 | 0:23:30 UTC
Last modified: 8 Jan 2021 | 0:25:26 UTC

I replaced the bad thermal paste job and got rid of that useless GTX770 and everything is working as intended now at 100% CPU usage.

CPU is also holding at 2.89Ghz

Profile mikey
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Joined: 17 Mar 09
Posts: 1275
ID: 37043
Credit: 528,106,094
RAC: 133,505
Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (2,038,739)Cullen LLR Ruby: Earned 2,000,000 credits (2,074,615)ESP LLR Ruby: Earned 2,000,000 credits (2,243,517)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,142,353)PPS LLR Turquoise: Earned 5,000,000 credits (7,292,459)PSP LLR Ruby: Earned 2,000,000 credits (2,232,103)SoB LLR Ruby: Earned 2,000,000 credits (2,934,612)SR5 LLR Ruby: Earned 2,000,000 credits (2,053,250)SGS LLR Turquoise: Earned 5,000,000 credits (5,152,318)TRP LLR Ruby: Earned 2,000,000 credits (2,405,015)Woodall LLR Ruby: Earned 2,000,000 credits (2,014,811)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (23,770,672)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (944,431)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,813,253)PPS Sieve Double Silver: Earned 200,000,000 credits (341,772,287)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,446,797)AP 26/27 Sapphire: Earned 20,000,000 credits (33,140,471)WW Ruby: Earned 2,000,000 credits (2,884,000)GFN Sapphire: Earned 20,000,000 credits (49,299,387)PSA Sapphire: Earned 20,000,000 credits (20,457,430)
Message 147434 - Posted: 8 Jan 2021 | 12:44:03 UTC - in response to Message 147429.

I replaced the bad thermal paste job and got rid of that useless GTX770 and everything is working as intended now at 100% CPU usage.

CPU is also holding at 2.89Ghz


WOO HOO!!!

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Message boards : Problems and Help : Can't figure out why CPU isn't being used 100%

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