Hitting a wall ocing my e8400

[fezhead24]

Ive had my e8400 for a couple days and I'm trying to get it to 4.0ghz stable for 24/7 use. The problem is I've gotten 3.8 stable at 1.28v but I cant even get orthos to run for more than 20 minutes at 4ghz without ramping the vcore up to 1.39 (1.42 in bios). The jump isn't even worth it for that much voltage and i'm wondering if you guys have any advice for me to try.

I've tested the ram with memtest test #5 and its passed 10+ passes with no errors. I'm on a ga-p35-ds3l with a xigmatek1283 HS.

Heres the pic of 3.8 stable (orthos ran for another 10 hours after the pic).

3.8stable

 

[myocardia]

That sounds about right to me. That's how overclocking works, YMMV.

 

[footballrunner800]

yup thats exacly what happened to me. I need 1.42 in bios for it to be stable in orthos and even then it randomly freezes/ I tried upping all the voltages but still needed the same vcore. It looks like the older 8400s are better than the newer ones

 

[M1A]

What ram are you running and is it 1:1 or a higher std mult? That low vcore volts and then a wall and orthos quits tells me its your ram or your ram volts or NB. I had to get 1066 dominator ram to fully clock my 8400......
The old ballistic could not keep up.

 

[sammajidi]

fezhead24:

Yep... it take very little power up to 3.6/3.8... but after that you really need to step it up.

I have bios set to 1.4205v (something like that), actual voltage turns out to be around 1.44v (CPUID)

I could not keep it stable @ 4.05 (450*9) until I increased NB & SB to 1.5v. (1.42v at first, but finally 1.50v).

Running it @ 1:1 with the ram @ 450x2.



m1a:

You seem to have a great chip! 4.2Ghz with only 1.365/1.256v is pretty sweet!
Perhaps the secret is in the lapping?

I am about the upgrade my RAM as well. Dominator seems like the way to go... my HyperX has been pretty good up to 450x2, but that looks to be the limit.

 

[Sarsbaby]

Originally posted by: footballrunner800
yup thats exacly what happened to me. I need 1.42 in bios for it to be stable in orthos and even then it randomly freezes/ I tried upping all the voltages but still needed the same vcore. It looks like the newer 8400s where better than the newer ones

You mean the older is better than newer right? I have been finding the same conclusion from the research i've been doing on these CPU's.

It seems that the longer production of these have run, the worse they have gotten as far as how much vCore you need to reach 4ghz stable. If you can even get 4 out of them anymore.

I have a list of good and bad batches starting to fall into place along with actual results.

http://www.ocforums.com/showthread.php?t=560531&page=3

 

[error8]

Originally posted by: sammajidi
fezhead24:

Yep... it take very little power up to 3.6/3.8... but after that you really need to step it up.

I have bios set to 1.4205v (something like that), actual voltage turns out to be around 1.44v (CPUID)

I could not keep it stable @ 4.05 (450*9) until I increased NB & SB to 1.5v. (1.42v at first, but finally 1.50v).

Running it @ 1:1 with the ram @ 450x2.



m1a:

You seem to have a great chip! 4.2Ghz with only 1.365/1.256v is pretty sweet!
Perhaps the secret is in the lapping?

I am about the upgrade my RAM as well. Dominator seems like the way to go... my HyperX has been pretty good up to 450x2, but that looks to be the limit.

But isn't 1,5-1,55V for the north bridge dangerous?? I'm also hitting a wall on my e7200 at 3,8 ghz but I'm quite scared to pump so much juice into the motherboard.

 

[footballrunner800]

sarsbaby i fixed my post. Yea thats what i meant

 

[sammajidi]

Originally posted by: error8

Originally posted by: sammajidi
fezhead24:

Yep... it take very little power up to 3.6/3.8... but after that you really need to step it up.

I have bios set to 1.4205v (something like that), actual voltage turns out to be around 1.44v (CPUID)

I could not keep it stable @ 4.05 (450*9) until I increased NB & SB to 1.5v. (1.42v at first, but finally 1.50v).

Running it @ 1:1 with the ram @ 450x2.



m1a:

You seem to have a great chip! 4.2Ghz with only 1.365/1.256v is pretty sweet!
Perhaps the secret is in the lapping?

I am about the upgrade my RAM as well. Dominator seems like the way to go... my HyperX has been pretty good up to 450x2, but that looks to be the limit.

But isn't 1,5-1,55V for the north bridge dangerous?? I'm also hitting a wall on my e7200 at 3,8 ghz but I'm quite scared to pump so much juice into the motherboard.

Hmm... I do not know. I set the BIOS to 1.50v and I noticed it sometimes creeps upwards of 1.52v. I will look into this more...

 

[M1A]

I have my nb at 1.55v with my IP35 and it is doing fine. Others have it up at that also it was a lot of talk on this back in the begining of the year. And yes I guess I got a good chip but my holdup was the memory. Just be sure its not your problem.