Overclocking E8400

Njoshi

Njoshi

Njoshi

Associate
Joined
13 May 2011
Posts
100
I've always know that my processor has a lot of potential and can happily reach speeds of 4ghz after weeks of trying to get it close to 3.6ghz im starting to think ive got a bad chip!

At stock voltages i can reach about 3.3Ghz 366*9 with it being fairly unstable!

The board ive got is a AsrockP43DE! has anyone overclocked on it before and could give a few pointers.

E8400
AsRockP43DE
XFX 750W Core edition
 
What is the system voltage at? I think these will happily take 1.4v, depending on cooling of course.

What is your mem divider at? Is that running over stock speeds, or have you left in unlinked?
 
to hit 4GHz you'll need some big voltage... I'm running mine at 4.0 24/7 stable with a bios voltage setting of 1.5v (1.44 in windows)

If you've got all RAM slots full it could limit your OC potential... I've got 2/4 filled, but when I had 4/4 filled I couldn't get any stability at all (not even at stock unless I was still up on 1.4v)
 
Lower the multiplyer and see how high the fsb can go on your board. If you come to a unstable patch keep increasing as it could be an FSB hole. If 8x400 FSB doesn't work then you probably have a board that doesn't like that range and that's why 9x400 doesn't work.
 
My sons PC has a E8400 clocked to 3.5Ghz, not sure on the vcore as i left it to auto via the Gigabyte BIOS. Ill check on the vcore when i get home.

Cooling it is a freezer pro 7, temps are quite high when he games, however i think that is partly due to the case. Temps reach high 60s, which is a minor concern, however in the BIOS i set a safety margin of 90degrees.

Ive not had any expercience with Asrock boards, i prefer the gigabyte BIOSs
 
8igdave said:
Lower the multiplyer and see how high the fsb can go on your board. If you come to a unstable patch keep increasing as it could be an FSB hole. If 8x400 FSB doesn't work then you probably have a board that doesn't like that range and that's why 9x400 doesn't work.
Click to expand...

+1
Also can you specify if it's a CO or an EO chip?
 
My E8400 C0 does 3.6GHz (400x9) at 1.36vcore, my E8500 E0 does 4.18GHz (440x9.5) at 1.36vcore. Both on an DFI X38 board though.

Max stable clocks are 3.96GHz (434x9) at 1.4vcore for the E8400 and I've never really pushed the E8500 as far as it will go. It currently sits at 4.21GHz (443x9.5) at 1.39vcore.
 
I upped the voltage to 1.4 and reached 3.6 stable! but that was running on half my ram slots filled out! thanks for the replies! ^^
 
Found a screenshot from when I had my E8400 at 4.00GHz a while ago, was IBT stable.

89d2f5dd.jpg


Stupid photobucket resized it sorry :( Vcore was 1.288v
 
Last edited:
EniGmA1981 said:
to hit 4GHz you'll need some big voltage... I'm running mine at 4.0 24/7 stable with a bios voltage setting of 1.5v (1.44 in windows)

If you've got all RAM slots full it could limit your OC potential... I've got 2/4 filled, but when I had 4/4 filled I couldn't get any stability at all (not even at stock unless I was still up on 1.4v)
Click to expand...

Ive filled all my mem slots up, and pc is stable as a rock at 3.8 (9x422), with mem vols at stock of 1.9v and vcore about 1.32v.
 
Last edited:
Used to have a E8400 @ 4ghz using 1.35v.

Is the RAM set up correctly?

Obviously 6gb of RAM means 2 sets, so are the timings set so one pair is not getting overclocked?

Seem to remember, you have to up the northbridge volts a notch or two when using 4 sticks of RAM.
 
MeddlE said:
Andy, Enigma, what do you consider IBT stable? How many passes at what level?
Click to expand...

I'm not too sure now tbh it was nearly 2 years ago now. It was probably around 5 passes. I was never too bothered about stress testing as long as it was stable in use.

I kept it at 3.6GHz day to day use.
 
I have my E8500 stable at 1.39v and 20 passes of extreme. Thought it was stable at 1.36v as it managed 10 passes but it failed if I tried 20 passes. Just curious.
 
Yeah I'd agree with twenty passes... if it passes that, leave it overnight running prime95... If you wake up to a bare desktop, you know it failed LOL
 
orthos44.jpg
[/URL][/IMG]


took this over a year ago and still using the same settings!! 1.328v @ 4.4 on air... max temp 57c.. recently had it running at 4.7 to submit custom pc bench scores.. @ 4.8 it would not complete the benchmark..
 
EniGmA1981 said:
Yeah I'd agree with twenty passes... if it passes that, leave it overnight running prime95... If you wake up to a bare desktop, you know it failed LOL
Click to expand...

It had passed Prime for 12 hours at 1.36v and 10 passes of IBT quite happily, also OCCT for 2 hours, but wouldn't do 20 passes of IBT. IBT is new to me (been under a rock) so wondered what people regarded as "the test".

Any test fail means it's not stable though.
 
Yeah, technically if it fails anything, it's not 100% (well, it's never going to be guaranteed 100% even if it ran the tests for a month lol)

Pop the voltage up a notch and try it again :) the most common cause of fail (unless you're going for a crazy high OC) is the voltage dropping under load, up it a little bit in the bios and it shouldn't drop below what the chip needs when you stress it :)

Incidentally, TK421, how the fudge did you get 4.7 out of an 8400 on air!?!?!?

I was hitting 70c+ at 4.3! :(

You got something better than a TRUE I assume? lol
 
You must log in or register to reply here.
Back
Top Bottom