Bios voltages and Graphics

[waytoosmall]

I am using the evga 680i mobo:
I have seen a lot of posts about stock voltages for the Nforce Spp and HTnforce spp-mcp in several forums. I want to know what the max safe voltages are. I am trying to oc my 8800gtx's more and I thought those voltages were related to graphics. So far I am at:

Nforce SPP=1.55
Nforce MCP=1.625
HT nforce SPP-MCP=1.45

I have gotten up to 670/1003, but that seems to be as far as I can get with these voltages, but I wanted to check here first before I keep pushing. I keep seeing people with single GTX setups getting much higher OC's. Any input anyone?

 

[apdrummer]

According to the nvidia 680i overclocking guide (http://www.nvidia.com/docs/CP/45121/nforce_680i_sli_overclocking.pdf) the maximum safe voltages are 1.50v for the SPP and it says "any voltages not mentioned are best left on their auto setting, so I wouldn't have even gone that high.

Why do you need to go that high anyway? a single 8800GTX will beat out any DX9 card easily and If I read correctly you have 2 in SLI. I'd say just keep the voltages down so you can extend the life of that monster investment. If you really want to OC it, sorry, I can't help you. I just wanted to put in my 2 cents.

 

[Nitestick]

the mcp and spp are nVidia chipsets. raising the voltage won't do anything to help your graphics cards overclocking as far as i know. the spp i think *may* control a reference voltage for the pci-e slots but changing that won't really help.

 

[waytoosmall]

Nitestick, I tried out what you said, and lowered both nforce mcp and the spp-mcp. the nforce spp is directly tied to pci-express so I left that at 1.55. My 3dmark06 score dropped from 15,957 to 13,239 so those voltages do effect graphics performance in some way.