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Overclocking An E8400 System?

post #1 of 12
Thread Starter 
Hi guys. I would like to overclock my system but have no experience on the subject so hope you can help me. My system specs are:

OS: Windows 7
CPU: Intel Core 2 Duo E8400
Motherboard: GIGABYTE GA-EP35-DS3
RAM: GeiL Black Dragon 4x2GB, DDR2 PC2-6400 CL-5-5-5
GFX: ATI HD4890 1GB

All coolers are stock and my case is a Antec 900.

Reading a few of the threads on here I have high hopes for my setup so what do you guys think?
post #2 of 12
First, check out the Intel OC section for an in-depth guide. Second, that CPU/mobo combo is a good choice. I got my e8400 up to 4Ghz on a P35-DS3L. Third, you will probably want to trash the stock cooler and grab something like a CM Hyper 212+. It's the cheapest of the good tower coolers, and it will work well on that chip.
 
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post #3 of 12
Thread Starter 
Thanks for you quick reply. I'll look into getting a new cooler and see what I can achieve
post #4 of 12
You can run 4.0Ghz on the stock cooler... when I did it, my temps got somewhere around 70C, but never went much higher. However, an aftermarket cooler is definitely a good idea anyway.
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post #5 of 12
Thread Starter 
Cool. I guess the biggest challenge will be to find an appropriate OC that also caters to my RAM.
post #6 of 12
i have the same ram as you, and i have it at 990mhz with just 1 notch of extra volts.
just unlink the ram (so ram has no influence on oc) when you oc the e8400, then when you have your sweetspot fsb, then try unlinking the ram

edit
this is a very basic explanation of overclocking

its basic maths. your e8400 is rated at 1333mhz. you always divide this number by 4 so 1333/4= 333, this is your fsb.
then your processor (cpu) has a multiplier of 9
so 333 x 9 = 2997mhz or 3.0GHz

can you raise the fsb? yours is now 333. (333 x 9 = 2997mb or 3.0ghz ) try rising it to 350
boot into windows
download realtemp and coretemp (google them)
install and run them
then download intel burn test (ibt) and run it.
have a look in task manager and notice how much free ram is listed.

in ibt set threads to 2 (for 2 cores) and then click on custom ram and enter an amount just below the free amount.
eg. i have 2520mb free ram. so i enter 2500 into the custom ram.
run the test for 5 passes.
keep an eye on temps (do not let it go over 65.c)

if test runs fine, go back into bios, and change frequency (fsb) to 370 and repeat the tests.
keep doing this in 20mhz steps until windows will not boot. then just go back a step (remove 20 from the fsb) to the last stable frequency, or
just raise the cpu voltage a couple of levels. it should now boot.
its a balancing act, higher voltages will get you higher fsb, but it will also give you higher temps.

THE MAX TEMP FOR A E8400 IS 72.C.
TRY TO KEEP IT BELOW 60.C FOR 24HR USE

the trick is to do this step by step, and not go straight to eg. 400 (400 x 9= 3.6ghz), just take your time

get the cpu maxed before increasing the ram speed

also if going down this route, please get a proper cpu cooler.
there is a for sale section on this forum.
i bought my tuniq tower 120, used for £12 or about $15.
all i could get on my q6600 with stock cooling was 2.6ghz and it hit 70.c
now i have it at 3.3ghz and it reaches 70.c, that is a big jump, for $15
the q6600 has a higher max temp than your e8400
Edited by j.col - 2/24/11 at 12:56pm
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post #7 of 12
Thread Starter 
Installed RealTemp and CoreTemp and got a steady temperature of 84c which seemed very high. This was running at full CPU load tho (having 2 game windows open). This was last night and with no OC done at all.

Today I opened 1 game window, loaded up RealTemp and CoreTemp and this is what I've got so far after letting both programs run for a bit and finally closing down my game window and idling with only a browser window open.




Also - is it normal for my multiplier to go up and down depending on how much load there is on the processor? As you can see in the screenshot the multiplier is at 8.0. If I start a movie in VLC it will shoot up to 9.0.
post #8 of 12
Thread Starter 
I did a first OC and test and here're my results:



Having broken the 65c limit alrdy I'm suspecting my stock cooler needs to be replaced. What are your thoughts?
post #9 of 12
After market cooler is recommended.

Seeing you are only at 350FSB x 9 multi giving 3.15GHz. Long way to go

Your chip should easily do 450FSB x 9 multi giving 4050MHz.

Keep going Oh remember to get the aftermarket cooler! IBT does stress CPU alot hence the high temps. So you'd never see those temps during normal operation.
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post #10 of 12
Im sorry if the people in the previous comments disagree but I think using the stock cooler is a terrible option. I have an E8400 and at first used an Artic pro7 cooler. It was cheap and did the job until I got my recent graphics card which pulled more power through the board causing an increase in temperature. Now I use a Zalman CNPS9500A. It is a fantastic cooler for around £35. Keeps temps very low. On load when overclocked to 3.9 I get around 53 degrees. Also the notion of getting 4ghz on a stock cooler is also rubbish. This will not be stable. The highest stable clock I could get with the artic was 3.83. After that I got errors and random game crashes. The stock cooler also has far too much low quality heat paste on a pad. You will need to use a better quality paste like Artic silver.

All in all to achieve 4ghz you will need to raise your fsb voltage and NB voltage up a step or 2. The voltage hike needed to get to 4ghz from 3.9 makes it not a viable option for me as I do not intend on replacing it anytime soom. Generally speaking higher voltage shorter life
Edited by haza1981 - 3/11/11 at 4:37am
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