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Need some help my OC went bad after SLI

post #1 of 13
Thread Starter 
I had a stable overclock few months back. it could do 3 hours of Linx during the day. And did a 24 hour run of prime95 since then I added a second GTX 570 and now have two of them in SLI. And now had LinX shot a error 30 minutes in and prime95 shot a rounding error at about 3 hours. So is this related to the SLI and PCIe port being used ? And if so what voltages should I focus on bumping up to stablize ?
 
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post #2 of 13
id think its due to the drop in 12v rail voltage. when you add a second card in crossfire or sli then it can cause the 12v rail to drop below 12v, if your board ( most do) has a 12v molex header for boosting your 12v rail then use that and you should see stability come back
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post #3 of 13
Thread Starter 
I have AX1200 PSU. I also have a Kill-a-watt and I'm only drawing 650watts on full load. So I thought my rail should be fine. But if your saying its because the Motherboard isn't getting enough voltage then I could see that. But I though for the CPU it used its own voltage. I know my motherboard doesn't have the molex header but I know I seen those booster thing evga sells.
 
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post #4 of 13
The only way adding a second GPU could throw your OC unstable is the NVidia chip that controls SLI needs a bump in volts (unlikely) or your PSU is failing to supply quality power.

You can't just assume the PSU is OK because of it's specs, any more than you could assume your GPU is fine just because it's a GTX570.
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post #5 of 13
Thread Starter 
Quote:
Originally Posted by 2thAche View Post
The only way adding a second GPU could throw your OC unstable is the NVidia chip that controls SLI needs a bump in volts (unlikely) or your PSU is failing to supply quality power.

You can't just assume the PSU is OK because of it's specs, any more than you could assume your GPU is fine just because it's a GTX570.
okay what should i do
 
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post #6 of 13
Go into Bios and check your power supplie's voltages.
3.3v should be at 3.3v, 12v should be at 12v, ect ect...

If they're not, you can manually up the voltages using tools.
Read your PSU manual/check online about changing voltages properly.

Some power supplies require the user to open it, which can void warranty. Hopefully you don't have to in your case.
    
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post #7 of 13
Remove one of the video cards and do another test just to make sure that your CPU hasn't degraded. I know you don't want to do this, but before you start trying to spend tons of cash "Fixing" this problem, you need to do the easy, free stuff to make 100% sure, first. You don't want to be barking up the wrong tree...
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post #8 of 13
Thread Starter 
I did test the day before i got the card. So there is no degration. Im stable by going down just slightly to 4.2ghz is stable It was at 4.25ghz So I think its just a voltage like a slight bump some where will stablize it like pll or qpi or something i just was hoping to know where to start a voltage bump
 
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post #9 of 13
um you need to always increase the IOH voltage when running SLI and OCing.
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by Sin0822 View Post
um you need to always increase the IOH voltage when running SLI and OCing.
Thanks plus rep
 
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i7 3930K 5Ghz Bench ASUS X79 Rampage IV Extreme 3x AMD 7970's w/ EK water blocks Samsung 16GB (4x4gb) 2400Mhz 10-12-12-31-1t @ 1... 
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128GB Samsung 830  RX360, RX240, EX360 XSPC Raystorm CPU Block QNIX QX2710 27" 2560x1440 @ 114hz 
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Corsair K90 Corsair AX760i Corsair 700D Modded w/ External Radiators 
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