Inceasing GPU Vcore

snipester89

Distinguished
Aug 18, 2009
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18,510
Hi,

I just recently bought an HIS 4850 512mb Turbo ICEQ4 video card and I think I can get a pretty hard OC from 685/1100 to 750/1100 by increasing the GPU Vcore. I can get it up to 730/1100 very stable and with no heat issues (maxed at 52c Furmark) but any more and the card is unstable. What I'm thinking is that if I increase the GPU Vcore from 1.12 to 1.175 I could get a pretty stable overclock out of this card. I just can't seem to find anything that will let me increase the voltage. Obviously they tried to make it newbie-proof.

I looked pretty thoroughly through Rivatuner and didn't find anything about voltage.

I tried a custom BIOS flash by downloading the HIS BIOS update and modding it but all that did was make an unstable video card (it showed me my core clock was 125mhz and my memory clock was like 9 million mhz).

I don't have a working floppy drive, I haven't used it in years anyways.

My motherboard BIOS doesn't even mention a video card besides which video to use (Onboard or PCIe)

Seems like I've heard that ATiTool will let you get into the GPU Vcore but I cant even get it to run on Windows 7.

I'm out of ideas. I guess I don't really need to overclock any more than I already have but I'll take any advise given here.


Thanks




 

snipester89

Distinguished
Aug 18, 2009
16
0
18,510


Hey and thanks for replying.

I ran Voltage Factory however all 4 I2C Busses came back invalid. What did I do wrong?