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IOH/GPU Voltage?

post #1 of 11
Thread Starter 
I am trying to overclock my GPU. Here are my specs:

EVGA SuperClocked GTX 580 x 2 (SLI)

STOCK:

797/1594/2025
1.088v

CURRENT:

940/1880/2100
1.1v

I only increased the voltage because I wanted to make sure it would be stable.

I wanted to try to get to 960/2200 or at least 940/2200. Can someone help me reach this goal?

Would the IOH voltage in the BIOS settings help/affect this in any way or should I keep focused on the GPU voltage?
post #2 of 11
With a pair of WC'd 580's I'd highly suggest bumping your IOH to at least 1.24v. In addition, set PCIE frequency on the main BIOS page to 101. Other than that I recommend focusing mostly on the core voltage to the GPUs. I'd focus on getting the cores to run several hours stable on a maxed out Furmark. To get a basic idea of what you're in for, just make 5-10Mhz bumps in MSI Afterburner every 10 minutes or so while Furmarking.

Memory clocks come next. You can get those suckers tested with this handy utility designed by F@H:
http://folding.stanford.edu/English/DownloadUtils

Be sure to run one for each GPU. In addition, be sure to run the "Multi-GPU" version of Furmark. Glad to see your rig is coming together.
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by mymlan View Post
With a pair of WC'd 580's I'd highly suggest bumping your IOH to at least 1.24v. In addition, set PCIE frequency on the main BIOS page to 101. Other than that I recommend focusing mostly on the core voltage to the GPUs. I'd focus on getting the cores to run several hours stable on a maxed out Furmark. To get a basic idea of what you're in for, just make 5-10Mhz bumps in MSI Afterburner every 10 minutes or so while Furmarking.

Memory clocks come next. You can get those suckers tested with this handy utility designed by F@H:
http://folding.stanford.edu/English/DownloadUtils

Be sure to run one for each GPU. In addition, be sure to run the "Multi-GPU" version of Furmark. Glad to see your rig is coming together.
Thanks mate!

Mind if I ask why I should change that to 101 and IOH to 1.24v? Does it increase stability? Just wondering. I like to have a reason if someone asks "why is that there?"

post #4 of 11
Repeated tests have shown that a PCI-E frequency of 101 has improved stability both with high BCLK's and CF/SLI setups. Raising IOH voltage will help the northbridge keep up with the large amounts of data that will pour out of your SLI'd 580's.
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post #5 of 11
Thread Starter 
Those programs you gave me, the MemtestCL and G80. I upped my memory to 2300 and I'm not getting any errors in MemtestCL...

Should it be this high?
post #6 of 11
Well, you've got a well-cooled system and some well-binned chips. I'd say keep pushing it! :]
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by mymlan View Post
Well, you've got a well-cooled system and some well-binned chips. I'd say keep pushing it! :]
Haha thanks. But then so why does the core clock only get to 940 before it starts crashing. No artifacting or throttling, just a driver/PC crash?
post #8 of 11
Thread Starter 
?? bump
post #9 of 11
1.24V is a fair bit for IOH, using multi gpu I usually go as high as 1.2 or so when benching at 5Ghz +. 1.14 - 1.16 should be plenty for 24/7.
Increasing PCI-E will have pretty much no effect, really the only reason to increase the pci-e is to get past the 220 bclk wall. I would just leave it at 100.
If it is crashing at 940+ & adding voltage doesn't help or makes it crash faster the problem is probably heat. On water my 580 at 1.188 will do ~980Mhz at room temp, & 1000Mhz with chilled water . At the same voltage at -100° it will do closer to 1200Mhz.
    
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by FtW 420 View Post
1.24V is a fair bit for IOH, using multi gpu I usually go as high as 1.2 or so when benching at 5Ghz +. 1.14 - 1.16 should be plenty for 24/7.
Increasing PCI-E will have pretty much no effect, really the only reason to increase the pci-e is to get past the 220 bclk wall. I would just leave it at 100.
If it is crashing at 940+ & adding voltage doesn't help or makes it crash faster the problem is probably heat. On water my 580 at 1.188 will do ~980Mhz at room temp, & 1000Mhz with chilled water . At the same voltage at -100° it will do closer to 1200Mhz.
Is that a lot of voltage for 24/7 SLI cards? I'm trying to figure out what I should set my voltage at for 24/7 use before I start tweaking my OC.
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