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My misfortune with e8400's...so far? - Page 4

post #31 of 48
Something is defiantly amiss here...
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post #32 of 48
Well, you pushed your CPU over the maximum vcore spec for that CPU. Requiring more voltage to get what you had before is a sign of the CPU wearing down.
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post #33 of 48
Quote:
Originally Posted by Static|X View Post
A few weeks ago I bought an OEM e8400. I was looking for an upgrade from an e2180 OC'd to 3.33ghz with 1.35 vCore. Love that CPU but it couldn't really push out the a great framerate in TF2 with a lot of action. If you're wondering why I upgraded my CPU and not GPU, TF2 is much more CPU dependent than most games. I was in the market for an upgrade anyways, and the e8400 seemed like the perfect fit.

That e8400 ran 100% stable @3.6ghz with 1.3vCore. I ran normally @ 400x9 with a 1:1 on the RAM. I tried a few times to get to, what I thought was a fairly common, 4.0ghz with it. The best result I got was about 20 minutes in Orthos @ 3.9ghz with 1.425vCore. I didn't want to push any higher than this because really I'm looking for a 24/7 overclock.

So...I figured I'd give it another go. The Egg was out of stock of the OEM e8400 so I figured I'd mix it up and get a retail boxed - ended up being the same price due to the price drop a week after I bought it. I got nearly identical results. I got 18 minutes of Orthos in with 3.8ghz @ 1.4vCore...

So I'm determined to figure out whether I'm just unlucky, or I've yet to hone my overclocking skills enough to figure out what the heck is stopping me from reaching a stable 4.0ghz at a reasonable (under 1.4) vCore.

This time around I even gave my computer a complete cable management session to maximize the airflow. I took extra care to be sure my cpu was getting as much cooling as possible - so I can experiment with -slightly- higher vCores.

I'm currently set up at 3.6ghz with 8x450FSB.
My ram is running @ 900mhz 4-4-4-12 timings with 2.1v.
I've got 0.2+ on the FSB and northbridge.
I lose about .05 after vDrop (1.3v in BIOS to 1.25v under load).
My temps, which match in Speedfan + Everest, are ~25c idle and ~40c under load.

I'm currently @ 30 minutes of Orthos and going to bed confident I'll wake up with it still going.

So if my system works just fine with this setup, but I up the multiplier back to 9...does that 100% mean its got to be my CPU not getting enough juice? Unless of course my PSU was crapping out on me, doubt that though I'm confident in my OCZ.

I've taken the time to come up with what I think should be useful to maybe 1 person...if you've got any constructive input at all please lend a helping hand.

P.S. - In regards to my maximum core voltage...should I be most concerned with what CPU-Z / Everest report my vCore as, or what I set it in BIOS?
just an observation, there would be no difference in TF2 between 4G and 3.3G...I max it out at 3.2...
post #34 of 48
Thread Starter 
Quote:
Originally Posted by Xtek View Post
Well, you pushed your CPU over the maximum vcore spec for that CPU. Requiring more voltage to get what you had before is a sign of the CPU wearing down.
Granted it was for 20 minutes under load ....does 1.375 volts actually go through the cpu even when its idle over night? It was idling around 24 celsius...
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post #35 of 48
Thread Starter 
Quote:
Originally Posted by mcogan10 View Post
just an observation, there would be no difference in TF2 between 4G and 3.3G...I max it out at 3.2...
Not sure where you drew that conclusion from but its not true. I've run my own tests from 3.0ghz to 3.2ghz to 3.4ghz and 3.6ghz - increasing my minimum fps up about ~5-10fps every time.
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post #36 of 48
Quote:
Originally Posted by Static|X View Post
maybe my motherboard just isn't having it?
if i bought any 780i board it'd probably be the eVga ...seriously considering buying one today...


If you like to watch video....I'd reconsider at this point... Whole bunch of us 780i owners getting really pissed at this point:

http://www.evga.com/forums/m.asp?m=253891
    
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post #37 of 48
Quote:
Originally Posted by Static|X View Post
I've come to the conclusion that my luck with e8400's is just horrible. I don't understand how I get 2 chips that overclock to 3.6ghz with absolutely no change to voltage. But the second I try to get above that it wants at least 1.4v to be stable.

.


I'm in the same boat. 3.6ghz with stock voltage...no problem. 3.8 ghz, lots of tweaks and high voltage needed. Can't get 4.0 stable at all, got tired of trying.
    
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post #38 of 48
Quote:
Originally Posted by RoadRashed View Post
I'm in the same boat. 3.6ghz with stock voltage...no problem. 3.8 ghz, lots of tweaks and high voltage needed. Can't get 4.0 stable at all, got tired of trying.
Same here, I can do 3.6GHz at around 1.24v, 3.7GHz at about 1.30v, 3.8GHz I haven't even gotten stable at 1.3625v...I don't think my FSB is the problem either, I bumped it up to 450x8 and it was stable, its just anything over 3.75GHz requires a lot of voltage no matter the FSB or multi. Its strange how its so easy to hit 3.6GHz, on stock voltages in a lot of cases, but anything over that requires a huge leap in voltage.
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post #39 of 48
Quote:
Originally Posted by Static|X View Post
Granted it was for 20 minutes under load ....does 1.375 volts actually go through the cpu even when its idle over night? It was idling around 24 celsius...
AFAIK, yes, it's 1.375V supplied to it the whole time, but it's that combined with load (current) which is creating the heat. So you've got the electron migration issue w/ the voltage, but if it's idle you don't have to worry about heat damage.
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post #40 of 48
Thread Starter 
Well I'm glad im not alone in this boat any more - any idea what batch codes you guys received?
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