What about crunching with NVS 300 and NVS 290?
I found 3 pieces of each in an old box.
Thy have DDR3 512 MB and DDR2 256 MB.
Is pure trash? Or can contribute?
It's not pure trash as long as they work. Try a GFN15 here or GFN14 (at stream's server at http://boincvm.proxyma.ru:30080/test4vm/) and see how long it uses. If it's longer than 10 minutes for GFN15 and longer than 5 minutes for GFN14 then don't use it for PG. Use them as bookends or pure display GPUs.
waiting for a TdP prime...
Proth "SoB": 44243*2^440969+1