Originally Posted by Farih
No, The 7850 cant be clocked as high as a 7870 in general, that is because the 7870 has voltage control and the 7850 doesnt.
At least Sapphire HD7850s have
GPU voltage control. Look at my results couple of pages ago.. Just MSi AB does not support it yet.
For overvolting your HD7850 use Asus GPU tweak. Its works just fine. If you are not familiar with Asus GPU tweak then be aware that you need to switch it on advanced mode and for more range of clocks you need to select the thingie in options tab as well.
The HD7850 GPU voltage is controlled by NCP5395T, which allowes voltage tweaking by software.
I also used multimeter to measure real voltage given to GPU
As i remember, the card is quite heavily overvolting itself. Stock voltage was around 1.09v and when pushed to 1.225v on Asus GPU tool, the real voltage was 1.29v on load.
My card did 1240mhz GPU on 3Dmarks.
Unlike HD79xx the HD78xx doesnt have memory overvoltage by software. For this you would need vmem hardmod.Edited by Supranium - 4/10/12 at 9:33am