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Old 02-04-2007, 09:39 PM   #1 (permalink)
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Default Bios voltages and Graphics

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?
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Old 02-04-2007, 10:29 PM   #2 (permalink)
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According to the nvidia 680i overclocking guide (http://www.nvidia.com/docs/CP/45121/...erclocking.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.
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Old 02-05-2007, 01:21 AM   #3 (permalink)
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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.
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Old 02-05-2007, 03:48 PM   #4 (permalink)
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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.
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EVGA 680i
C2 Q6600 @3.6
2- 1GB Crucial Ballistix DDR2 1000(1100 @5-5-5-12 2.2v)
2 EVGA 280GTX in sli
2 WD Raptor 74GB(RAID0)
1 WD Raptor 150GB
X-FI Fatal1ty Edition (Beyerdynamic DT770/80 with PA2v2 amp)
PC P&C 1 Kilowatt PSU
Dell 3007 WFP 30" LCD
LG 18x DVD/CD RW
Silverstone TJ09 (5-120mm Sythe S-Flex fans)-Best case on the planet...
Watercooled. Iwaki MD20RLT>PA120.3(6 fan push/pull)>Apogee GT>2 MCW60's>T-line
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