There are a few other threads with various GPUs, but I decided to start this one to get all the information in one place.
What we will be looking at are the given P/day speeds of various GPUs. Since the various GFN ranges use different amounts of CPU to feed the GPU it's important to state which range you are referring to. GFN17 will only sieve as fast as 1 core of your CPU can feed it. For GFN22 it is far less CPU dependent and it is easy to feed newer high end cards to their maximum P/day potential.
GPU core clocks also matter so if at all possible use GPUz to see what core clock speeds are for your GPU.
From GFN22 sieving tests this is what I have personally seen. Test run on a test range using the following after the command line "22 100000 200000 B13 W1" (with D1 where necessary to specify the second GPU)... I let it run for a bit and let the temps heat up till it reached a near stable speed Mhz wise as shown in GPUz.
Here are my findings:
EVGA 1050 Ti (not sure the exact model)
Core Clock - 1391-1500Mhz (bouncing around due to thermal throttling)
GFN22 P/day - 52-53P/day
Gigabyte 1060 6gb (GV-N1060WF2OC-6GD)
Core Clock - (needs to be rechecked, currently at a remote location)
GFN22 P/day - 105P/day
EVGA 1070 (SC GAMING ACX 3.0 Black Edition, 08G-P4-5173-KR, 8GB GDDR5)
Core Clock - 1860Mhz
GFN22 P/day - 153-155P/day
EVGA 1660 Ti (XC Black GAMING, 06G-P4-1261-KR, 6GB GDDR6)
Core Clock - 1950Mhz
GFN22 P/day - 410P-414P/day
Gigabyte 2080 (GAMING OC 8G Graphics Card, 3 x WINDFORCE Fans, 8GB 256-Bit GDDR6, GV-N2080GAMING OC-8GC)
Core Clock - 1965Mhz
GFN22 P/day - 717P-720P/day (note: I've seen this up to over 800P in the 820P/day range)
A few links to threads of interest -
Geforce 1060 6b performance findings - http://www.primegrid.com/forum_thread.php?id=8045
Geforce 1070 sieving performance findings - http://www.primegrid.com/forum_thread.php?id=8250
RTX 2080 sieving performance - http://www.primegrid.com/forum_thread.php?id=8322