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Strange E8400 OC Behavior

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dmjohn29

n00b
Joined
Feb 11, 2008
Messages
12
I have a Gigabyte GA-EP35C-DS3R with an E8400 OC'd to 3.6GHz (FSB 400x9 at 1.275v.) At boot it's running about 2.4GHz with EIST enabled. But if I run Prime or OCCT even at full load it still runs at 2.4.

However, if I run Everest Ultimate it kicks up to 3.6GHz and from that point on will fluctuate between 2.4 and 3.6 depending on load, even after unloading Everest. Once I run Everest all seems normal and stable.

Increasing vcore doesn't seem to help, in fact benchmarks drop as I go past 1.275.

Any suggestions? Obviously I'm new at OC'ing (my first non-Dell).
 
how are you verifying its running 2.4 at full load? What program are you using?

Have you let it run for more then a minute? Sometimes it can take a little bit to kick in.

vcore has nothing to do with it, period.
 
EIST is controlled by the BIOS and the chip, running a software program on the desktop can't impact whether it is working correctly or not. I'd suspect whatever it is you are using to verify the speed.
 
Xenozx said:
how are you verifying its running 2.4 at full load? What program are you using?

Have you let it run for more then a minute? Sometimes it can take a little bit to kick in.

vcore has nothing to do with it, period.
Click to expand...

I've used both Prime95, OCCT and Performance Test 6.1 running for about 10 minutes. Once I run Everest, I've run Prime95 for an hour without errors. It starts running at 3.6 GHz right away.

I use CPU-Z 1.44.1 to measure the speed. Is there a more reliable way to measure?
 
Not familiar with the gigabyte boards, but shoudlnt there be a setting in the bios to change the throttling?
 
I rebooted, loaded Prime95, CPU-Z and RealTemp and ran it for 10 minutes:

Capture1.jpg


I then stopped Prime95, ran Everest Ultimate, and again ran Prime95:

Capture2.jpg


I suppose I could just disable EIST, but that seems to me treating the symptom, not the cause. :confused:
 
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