Low gfx performance and trouble booting
2 x 4gb ram Corsair Vengeance
Saphire 7850 1GB
Win 7 sp1
When i do a slight overclocking (40x and Vcore=1.100) I am getting very low gfx performance.
Also it's a problem booting, and I have to cycle power a few times to get to boot properly.
The low gfx performance gives stutter in bios screen and windows (very low framerate).
Sometimes it boots ok and i have full gfx performance, but it usually takes 2-3 restarts.
If I use the i4770K integrated gfx, no problem at all. OC x42 and Vcore = 1.150 stable OCCT 1 hour.
At default settings (no oc) I have no problem booting and full gfx performance all the time with the HD 7850.
I think the saphire 7850 is the problem, any ideas?