Help with E8400 OC 4.5ghz

[Eddie313]

Just had a question i got my e8400 to 4.5ghz on 1.46 volts now i ran Orthos for 18 hours no problem.

Now everything flys but i tryed to play left for dead and got about 40 seconds in the game and my boot just rebooted?


core 4.5ghz 1.46
multiplier 9x
bus speed 500
Rated FSB 2000

 

[BlueAcolyte]

Oh jesus. Hmm, try running OCCT or Prime95 instead of Orthos.

 

[Eddie313]

Ran prime95 one core kepts going the other stops.
I up the volts to the ram and the cpu
Cpu @ 1.48 volts
Ram 2.2 volts 2.1 is stock

 

[BonzaiDuck]

Originally posted by: Eddie313
Just had a question i got my e8400 to 4.5ghz on 1.46 volts now i ran Orthos for 18 hours no problem.

Now everything flys but i tryed to play left for dead and got about 40 seconds in the game and my boot just rebooted?


core 4.5ghz 1.46
multiplier 9x
bus speed 500
Rated FSB 2000

How much experience do you have OC'ing? You'll find others posting here about their E8600, and they can only get to 4.5 Ghz with water-cooling. I believe Anandtech posted a recent article on a Gigabyte GA-EP45 motherboard, in which they'd pushed the voltage (wasn't clear whether it was the "set" or "reported" value) to 1.5V.

But the fact of the matter -- with the E8x00 C2D-Penryns -- is that Intel specs them for a "safe" voltage range of 0.85 to 1.3625V. They also note a wider range of operation with upper-bound of 1.45V, but insist that running the processor higher than 1.3625V for any length of time will degrade the processor quickly, and that it may continue to function "acceptably" at lower-volt settings thereafter.

I've seen a lot of posts, with several different chipsets -- for people running the E8400 to 4.0 Ghz. Many more who topped out around 3.8 Ghz.

Are you monitoring your tCase and core temperatures under LOAD? You didn't say what sort of cooling you use . . . Unless you're using (at minimum) water-cooling or phase-change, I would impose a self-limitation or target to overclocking the E8400 at somewhere between 4.0 and 4.1.

And anyway, you should be stress-testing (and temperature-monitoring) with PRIME95 multi-core version for 8 to 10 hours -- then run LinPack for 10 to 20 iterations (1.5 to 2 hours) before declaring the over-clock reliable or stable.

 

[Flipped Gazelle]

What PSU are you using? Perhaps once the video card kicks in the PSU spits the bit.

 

[Eddie313]

I ran prime for 36 hours on 4.0 just about stock volts.

I have a arctic cooler on it right and the room never see's temp over 65F
Guess ill leave it at 4.0ghz till i break out my water cooler.

As for the power supply i have a corsair 750tx

thanks

 

[Tempered81]

yah, I was going to say psu, but corsair 750 is plenty.

gpu's overclocked? what's highest speed before games "crash"? Probably needs more vcore on cpu.

 

[Eddie313]

I have it at 4.ghz 24/7

e8400
9600gt sli
xfx 780I mobo
corsair 750tx
antec 900 case
western digital 300gig raptor

Highest stable score is 18,023 3dmark06
cpu @ 4.0ghz
video cards @ 785mhz

Highest score but not prime stable was
cpu @4.5ghz
video cards 800mhz

3dmark06 19,989

 

[imported_wired247]

there's absolutely no guarantee the e8400 can run that high. hell, mine can barely do 4ghz without massive volts. the temps aren't the problem, it just can't get stable above this speed.

back off to a stable OC and accept it. if you need higher OC then get the e8600, or hell... wait for the e8700

 

[BonzaiDuck]

Originally posted by: wired247
there's absolutely no guarantee the e8400 can run that high. hell, mine can barely do 4ghz without massive volts. the temps aren't the problem, it just can't get stable above this speed.

back off to a stable OC and accept it. if you need higher OC then get the e8600, or hell... wait for the e8700

Ditto. I couldn't get mine beyond 3.8, but then, I didn't want to push the VCORE "set" value beyond a 1.31 to 1.34V range at that time. If the idle "reported" value is lower than 1.36V, you could push it to whatever notch and label will give you that.