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Volts Question: E8400 to 4GHz.

post #1 of 41
Thread Starter 
Okay, so I've put my new E8400 in today and I'm determined to get it to 4ghz with my zalman 9500 cpu cooler helping.

I've never played with volts while OC'ing before, and I know I'll need too. My only question is, what is a reasonable volt jump? My cpu atm is on 1.225v and I'm wondering in what steps I should up it too if I find my pc not booting while I up the fsb.

EDIT: Okay so after a lot of stuffing around, I can only manage to get my cpu to boot at 3.5 without freezing I've tried upping the NB volts, running 1:1 with my ram, changing ram volts, and of course upping Vcore. None of this is successfully helping. Highest Vcore I ran at was 1.33, but the strange part is that I'm pretty sure CPUZ didn't read it that high.

I noticed in my BIOS that under a different tab (Power > Hardware Monitor > Vcore Voltage) my Vcore is set 1.21... and the only other option I can change it to is "ignored". Should I change that at all? CPUZ says my cpu is at 1.225 but my BIOS in my cpu volts bit is set at 1.23 atm. Pretty sure it doesn't change from 1.225 in CPUZ if i go higher, either.
Edited by KHORR - 6/16/08 at 5:16pm
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post #2 of 41
You are safe till you get to 1.36 vcore. After that don't push it. Just push the fsb till it can't boot or stress test is unstable then bump up the vcore. You can bump up the nb to 1.4v to help make it more stable.
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post #3 of 41
Thread Starter 
Okay cool, so there's no really harsh jumps for vcore?

Also, I just noticed my motherboard is saying my cpu is at 1600 FSB, but cpuz is saying it's at 1400...Could this be a voltage problem too? I've had it at 1600 FSB and running before, without changing volts.
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post #4 of 41
45nm = stay less than 1.4vCore. No 24/7 overclocks higher than 1.362 vCore(recommended)

Suicide runs at 1.6vCore have been done by some crazy guy (me) and a Q9450 lol.....
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post #5 of 41
Remember you resetted your mb. So you have to disable c1e,intel speedstep. And all that stuff.
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post #6 of 41
Thread Starter 
That's all disabled, but for some reason it won't boot out of BIOS past 3.5 now. Max volts I tried was 1.3, but I haven't gone any further. I'm thinking it could be a memory thing... I'm still running my ram at 800hmz. Should I have it linked at 1:1 or unlinked and keep it at 800?
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post #7 of 41
Quote:
Originally Posted by KHORR View Post
That's all disabled, but for some reason it won't boot out of BIOS past 3.5 now. Max volts I tried was 1.3, but I haven't gone any further. I'm thinking it could be a memory thing... I'm still running my ram at 800hmz. Should I have it linked at 1:1 or unlinked and keep it at 800?
I would run it unlinked for now.

Perhaps try upping your NB voltage? ~1.4V is where I would set it at. But 1.35V or so should be your CPU voltage for 24/7 usage. Above 1.36V is asking for trouble, though it's OK as a suicide shot. I have booted as high as 1.425V in order to hit 4.2 GHz stable, but I run it under 1.3V for all day, every day use.
    
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post #8 of 41
Thread Starter 
My PC isn't on 24/7 anyways, I turn it off every night before bed.

So I should put my vcore at 1.3-1.35 for now and try push it as far as I can? In what increments should I up my FSB?

Thanks for the help
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post #9 of 41
I usually up my FSB 10-15 MHz at a time. Once you get past 400 FSB, I'd start doing 10 MHz increments, just to find the breaking point.

As for pushing voltage, the 45nm chips are more sensitive to high voltages, so I can't recommend you run it over 1.4V. Of course, I ran mine higher than that, but I can't guarantee you won't damage your chip above 1.4V. I would just play it safe for now, and hopefully you can hit 4 GHz. Best of luck.
    
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post #10 of 41
Thread Starter 
So once you up it enough to reach the non-post point, you up the voltages a little? Thanks a lot btw, for all your help I've bumped my NB volts up to 1.4 now. (1.39 for my board)
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