Help with overclocking a 2600K

[EniGmA1987]

So I got myself a 2600K processor that I am trying to overclock on an Asus P8P67 motherboard. It is the L040 batch which is known to be really good overclockers. However I cant seem to get stable over 4.25GHz unless I use 1.4v or something dumb like that. I am thinking it is my motherboard that is just trash because it was shipped with an 0402 bios, which isnt even listed on the site and Asus says the first bios release was 0804. I upgraded to 1003 and tried 1053 as well. 1053 seemed slightly less stable for me, but at least on these newer bios versions I am able to break 4GHz.

Can anyone help me with settings I can/should try to get up to at least 4.5GHz?

So far I have tried as much as 1.4v on the core and 1.95v on the PLL, and load line calibration set to high. IntelBurnTest says I am stable, but I have been having a crash every day for the last 3 days at anything over 4.25GHz. If I lower my core speed, no crashes. It has crashed when watching a YouTube video, playing Minecraft, and after 5 hours of I.B.T. running with all cycles of the test computed properly right up until that point. SO it isnt any specific thing that crashes the computer, it just will hapen at random when running higher than 4.25GHz

Temperature wise, I max at 73C on my hottest 2 cores @ 100% load after 15 minutes.

I have:
Asus P8P67 motherboard
i7 2600K processor
Prolimatech Megahalems with good fan
Diamond IC 7 TIM
2 x 4GB G.Skill Ripjaw memory, DDR1600

[Loser777]

What memory are you using?

[kevink82]

Did you enable auto pll overvoltage? change the pll back to 1.8v and use auto pll overvoltage and give it a go.

Also intel burn test is no longer a vliad test as it turns out it doesnt stress the cpu enough, use prime 95 small fft test instead.

[orion23]

Page 2 here will show you the right options:

http://www.xtremesystems.org/forums/...=265228&page=2

CPU ratio make it 45 for 4.5ghz, 48 for 4.8ghz

For voltage, try 1.390 (@ your own risk)....

Chances are you'll be able to lower the voltage after you play with the settings some more...

[EniGmA1987]

I think I figured out when it is locking up, it seems to happen when the processor is in its down-clocked 1.6GHz state and it moves up to the higher speed state under use. It doesnt seem to matter how loaded the CPU is, and it doesnt always happen. But it happens at random any amount over 4.2GHz. I tried all the settings in that thread linked above and they didnt help, I tried raising the VMR frequency up to as high as 450 and it didnt seem to help either. I tried with SpeedStep on and off and it didnt make a difference. It seems like as long as the turbo boost is enabled, which it has to be for overclocking, that the processor SS is always enabled.

Does anyone have any more ideas on how to get this thing stable at a good overclock? 4.2GHz for this batch and a 2600K is really sucky I would really like to get at least 4.5GHz out of it.

[sin0822]

hmm have you tried setting everything to auto and then setting turbo multipliers to 45x and setting TDP and TDC to 300 each?

[EniGmA1987]

I just tested all day at stock speeds and everything at auto, no problems at all. Obviously being overclocked is causing it, I just dont know why the CPU is 100% stable in P95 small-fft and IBT stable at up to 4.5GHz, yet the computer will lock up at random when the processor comes out of its downclocked state at anything over 4.2GHz.

I will try your suggestions throughout tomorrow sin0822 and post the results tomorrow night

[vern]

Page 2 here will show you the right options:

http://www.xtremesystems.org/forums/...=265228&page=2

CPU ratio make it 45 for 4.5ghz, 48 for 4.8ghz

For voltage, try 1.390 (@ your own risk)....

Chances are you'll be able to lower the voltage after you play with the settings some more...

Internal PLL Overvoltage

[EniGmA1987]

Internal PLL Overvoltage

Doesnt do anything for me.



Ok so I tried 4GHz turbo speed rather than attempting at 4.5GHz because I was starting to see the problem of lockups at even slower speed than 4.2GHz now. And again, even at 4GHz the system is locking up at random when coming out of its downclocked state. Another odity is that even with Turbo off and speed step off, the CPU still down clocks to 1.6GHz when not doing anything. And even with turbo mode off, if the CPU multi is set at 40 in the bios I get lockups. The CPU still runs at the default 3.4GHz at max because turbo is off so the 40 in bios doesnt do anything like it is supposed to, yet I still find it very odd that I get lockups when it is set like this. If I turn turbo on and leave it at the default turbo speed of 3.8GHz I seem to run fine.

Could it just be a broken motherboard or CPU? It is after the return period for both so I can kinda screwed then

[EniGmA1987]

Alright I guess maybe it is just a bad motherboard. Last night my computer shut off for no reason and wouldnt power back on, looked like a short somewhere. I replaced the PSU and it still didnt work, and I found that when the CPU power was plugged in, the shorting hapenned but when CPU power was unplugged the board would power up but not post. So I got a replacement board today and hopefully it will work better.

Thanks for your help everyone.