what bench program is best for testing gpu OC

[Teletha]

which one should i use to test best stability when OC the gpu?

[DominicNikon]

valley benchmark and 3d mark is what i use

[Leonard]

All your used games and programs, why do i say this?....because a stress tester can and will test under a certain number of conditions that do not always encompass a random game or program.

 

If you just want one of those programs for whatever reason, you can use MSI's afterburner.

[OSBK]

valley benchmark and 3d mark is what i use

yup those are the best, but you can use msi kombuster, it's free and really good either, it includes gpu core burner which is good for testing stability

[Lord_Karango17]

I usually use either heaven or valley, because some of my OC's will complete a run of 3dmark and give good scores, but crash in valley/ games.

[swimsphinx]

for synthetic as people have said above Valley/Heaven and 3dmark are the general community favorites. But to really prove the stability of overclocks make sure to simply test them out in real games, real games can sometimes find instabilities that the synthetic benchmarks can't.