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?