Help noob OC E8500!!

n111ck

n111ck

n111ck

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I want to overclock my E8500 a little as its struggling in BFBC2.

However last time I tried OCing I blew the motherboard (theres a thread on here some where :( ).

I have an ASUS P5K motherboard.

I also have 4GB of 1066MHz RAM (to get it to work at that speed I had to change something in the BIOS but I cant remember what).

I also have an after market cooler on the CPU.

I just want bump the speed a little so am looking for quick / easy / safe suggestions?

:)
 
Put the fsb to 400, set the vcore to 1.3v, in the memory/fsb ratio bit, choose an option that will show ur memory being 1066 or under.

Save and reboot, when windows loads, stress test it with prime95 or intel burn test.

It is slightly abit more vcore then really is needed, would probably do that speed on stock, but can lower vcore later.
 
Have upped FSB to 400 with 9.5 multiplier = 3800Mhz on the CPU.

The DRAM frequency is 533.3 Mhz and the FSB: DRAM is 3:4 - so how do I get it to 1:1 and does it matter?

Also I left the voltage as auto - cpu z shows core voltage as 1.248 V - is this ok?

Also temp under load is between 60 and 64?
 
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I have now set the FSB to 400 and RAM to 400 so now its 1:1.

Am I losing much RAM performace doing this? Is this better than leaving it at 3:4?
 
might lose a little but id check the SPD of your ram in cpuz, note down what timings your ram will run at with 800mhz, these will be lower timings than your settings for 1066, once this is done you will never notice it.
 
I think it was 5 5 5 15 so would this have changed?

Whats the benefit of having 1:1 though as I reliased that it wasnt before I oc'd the cpu anyway?
 
Personally if the memory is fine using the 3:4 divider then leave it be, if not then yes use the 1:1 then, but check to see if the memory is fine and the overclock is fine by running prime95 Blend test.

The vcore that it is on, is fne, could easy get it lower but thats futher tweaking, and honestly its fine as what its at.
 
It failed Prime on one core after 5 mins.

Reduced the RAM and the same core failed after 30 mins.

Bumped up the vcore to 1.3 and all seems ok so may try putting the RAM back up.

Thanks for your help.
 
n111ck said:
It failed Prime on one core after 5 mins.

Reduced the RAM and the same core failed after 30 mins.

Bumped up the vcore to 1.3 and all seems ok so may try putting the RAM back up.

Thanks for your help.
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I have the same problem as you. I have an E8500 on 424 FSB with 9.5 multiplier giving 4.00GHz.

I can get the ram to run fine 1:1 (approx 800MHz) but when i up it to 1063MHz prime becomes unstable, its very frustrating not being able to run the ram at full speed.

I am going to play around with the timings and see if i can get better stability but i dont really know how to tune the RAM to be honest.
 
corkyo4 said:
I am going to play around with the timings and see if i can get better stability but i dont really know how to tune the RAM to be honest.
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I dont really get the RAM side either - I'm not too fussed but it is annoying.

What temps do you get on the E8500?
 
Try upping the dram volts a notch to see if it makes a difference. Could be your northbridge needs a bit more juice to handle the higher fsb too so investigate those possibilities.
 
n111ck said:
I dont really get the RAM side either - I'm not too fussed but it is annoying.

What temps do you get on the E8500?
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Well at rest im getting around the 39 degree mark. Under general loading of games im getting approx 45-50 degrees and under prime i have been getting 65-70 degrees. usually just around the 65 mark though, unless the house is hot then i get higher.

i dare say i can refine things to get lower values but i really cant be bothered to go to that level, i just want the ram to work at speed.

i use an arctic freezer pro rev 2 cooler


as for the dram volts and nb volts, ill have a play
 
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Im getting similar temps.

Prime kept failing on the same core each time not sure if that makes a difference (was rounding error).
 
The temps are about right, my E8400 @4ghz with 1.3v under cheapo water idles at sub 30's, Games at mid to high 30's, prime blend is max 45's, prime small ffts (works cpu more) is 50-55cc, intelburn test is 60c. Those are all core temps.

@n111ck
What prime test was it failing, blend, small or large FFT's

If small ffts then u may need abit more vcore, or north bridge volts.
If Blend then it could either be vcore, northbride or memory.
 
As above, if small fft's is failing that points to cpu not being stable (add more volts until it is, or lower fsb/multiplier if temps prevent this), whereas blend can be either cpu, NB or ram. I had my 8400 at 4GHz on 1.3V so you should be in the right range. I'd look towards your board/ram to fix this issue. I had to raise my dram volts ever so slightly to get my ram stable at stock speeds/timings so this could be your problem. Also, those temps are a bit high for prime even on air. Might be worth giving those coolers a bit of a dust or even reseating them with some MX-3 to bring them down a bit. Even my £12 zalman has lower temps at 4.5GHz so you should be able to achieve more with your hardware.
 
Failing 5 mins into a stress test means you are not THAT far off stable.

Usually if you are no where near than prime or orthos will fail within 10 seconds.
With a 5min fail, you will probably find that if you notch the cpu volts up one one more notch then it will only fail after 30-60mins.
 
mglover070588 said:
Failing 5 mins into a stress test means you are not THAT far off stable.

Usually if you are no where near than prime or orthos will fail within 10 seconds.
With a 5min fail, you will probably find that if you notch the cpu volts up one one more notch then it will only fail after 30-60mins.
Click to expand...

But failing after 30 mins is no good so make sure it's stable. I'd try running small fft's to see if that fails first (or drop the cpu multiplier way down and run blend) to see for sure if it's the cpu that isn't stable.
 
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