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Overclocking My intel E8400

post #1 of 20
Thread Starter 
i have intel core 2 Duo E8400 and i have P5N-MX motherboard, the E8400 is C0 stepping.

its currently at 333x9 multiplier so it puts it at 3.00Ghz help pls..

regards toddy

P.S if u need any screenshots let me know thnx.
post #2 of 20
Your C0 might limit you to 3.6GHz ~ 3.8GHz. Raise your voltages to 1.2v to start with and push your FSB up to 350, 375, 400, etc until you aren't stable anymore. Raise voltage until stable, then raise FSB again. Repeat until you've hit your wall.
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post #3 of 20
Thread Starter 
thats the problem i dont have any settings to change FSB it just says 1333Mhz :/ my mobo is crap...
post #4 of 20
Are you sure there aren't any jumpers on your motherboard that turn OC settings on and off?
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post #5 of 20
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

unlink your ram, so it stays at stock speeds, you can overclock the ram later

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. for now, and then at final speed you want, run for 50 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 375 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
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post #6 of 20
Thread Starter 
thts the thing i get all the info on FSB and stuff but its the option to change from 333Mhz.,, i carnt find it is there any programs tht will let u take screenshot of the bios then i can show u guys what i mean..

btw here is ascreenshot if u guys need it...

http://img703.imageshack.us/i/cpuidr.png/

also details bout my mobo, ano its rubbish but play crysis 2 full and black ops on max..

http://www.asus.com/product.aspx?P_ID=bLVB6rzf6bPajeg5
Edited by Toddy - 3/9/11 at 6:28am
post #7 of 20
Quote:
Originally Posted by j.col View Post
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

unlink your ram, so it stays at stock speeds, you can overclock the ram later

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. for now, and then at final speed you want, run for 50 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 375 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
Excellent
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post #8 of 20
Thread Starter 
i posted before metallicamaster3 just incase u guys never saw it..
post #9 of 20
Thread Starter 
i just changed FSB to 1400 and its nw @ 3.149Ghz

but it shows in speedfan as 3.00Ghz is tht normal?? anyways,

Here is a quick Screenshot of the change...

http://img718.imageshack.us/i/cpuid2.png/
post #10 of 20
ignore speedfan and trust cpu-z
also dont use speedfan for temps, use real temp or coretemp

you have it now at 1400, so the cpu is at 350mhz, so 350 x 9 = 3.15GHz
as your ram is rated at 400mhz you dont need to unlink the ram. for now
your fsb was 333mhz so raising your cpu fsb to 400 will not affect your ram, as they will be the same, also cpu-z will then show dram frequency as 1:1
so you can take it upto 1600
Edited by j.col - 3/9/11 at 7:07am
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Old Slow Hand
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