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EVGA 750i FTW Overclock Thread - Page 254

post #2531 of 2885
Quote:
Originally Posted by veblen View Post
I just got this board and am having mixed feelings about it. On the one hand, I managed to achieve a higher overclock on my q6600 (450x8) than I ever got with my old-but-still-working msi neo2-fr. However, it is not stable and reading the last few posts about how the board has problems with 8gb of ram leaves me worried. I have 8gb of gskill ddr2-1000 ram and am currently running them synced, i.e. 900 mhz, at 2.1v.

My vcore is currently at 1.48v (bios), 1.45 (windows 7), and it still fails occt stress-testing. I'm not sure how high I'd have to go to achieve stability. The vid of my q6600 is 1.3v.
Start by only running two dimms until you get your CPU OC stabilized. You may also need to adjust the GTL lanes to get her stable. Click the link in my sig for a 'how to' guide on the GTLs.
    
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post #2532 of 2885
^^^ Do that. Gtl lanes were key to getting my OC stable. Also, lower your memory speed to 800Mhz as the 750i isn't rated to run memory faster than that past 4GBs. Once your OC is stable then you can play around with the memory speeds.
post #2533 of 2885
Thanks for your suggestions, PizzaMan and ned99! I will work on it and hope to report good news soon!
    
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post #2534 of 2885
Okay, I lowered my FSB to 1700 for an overclock of 3.5 ghz (vcore still at 1.48v, 1.45 windows), set my memory to 1:1 (437.5 mhz), GTL lanes to 60, 50, 50, 65 mv, and so far, after half an hour of occt, it's still holding out! I know it needs more stress testing and will do so overnight, but occt used to report errors after 1 minute so this is boding well.

On a separate note, I seem to have encountered FSB holes at 1600 and 1700; the board refuses to post at these frequencies and I end up having to reset cmos. Is this normal? I'm running the latest available bios I believe.
    
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post #2535 of 2885
Quote:
Originally Posted by veblen View Post
On a separate note, I seem to have encountered FSB holes at 1600 and 1700; the board refuses to post at these frequencies and I end up having to reset cmos. Is this normal? I'm running the latest available bios I believe.
I used to have the same issue. It's pretty common.
post #2536 of 2885
FSB holes on the 750i FTW are extremely common so nothing to worry about, there's a guide floating around somewhere about them. Good to hear that you're making progress with your OC, I usually test with 25 passes IBT 1/2 Ram, 4hrs. OCCT Large, 6 hrs. Prime95 SmallFFT, 12 hrs. Prime95 Blend in that order. If it can pass that it should be stable.
post #2537 of 2885
It's likely a memory divider issue not a "FSB hole". The 7 series has looser straps then the 6 series nVidia baords and the tops of straps don't really cripple the board. Try playing with the memory.
    
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post #2538 of 2885
Finally got a stable 4.0ghz overclock at 500x8 but the nb is quite hot now. It's idling in the low to mid 50's. What do you guys do to keep it cool?
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post #2539 of 2885
Quote:
Originally Posted by Dee. View Post
Finally got a stable 4.0ghz overclock at 500x8 but the nb is quite hot now. It's idling in the low to mid 50's. What do you guys do to keep it cool?
Nothing. I use a fan rehobus so it's not even audible, but stills giving airflow.

The cooling, if you have the tiny fan installed, is always sufficient. Even I, with a 3,6 Quad Core at 1,55v, where the mosfets are going to cry as you can wonder, the heatsink can dissipate the heat from them, along with the NB and the SB.

Nothing to worry about
post #2540 of 2885
My NB idles at 49* and goes up to about 51* on load with my spp at 1.45v so I wouldn't worry about it. I've got a 60mm Vantec fan ghetto tied to it.
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