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My misfortune with e8400's...so far?

post #1 of 48
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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?
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post #2 of 48
unlink memory and try again, if you havent already. mines also like a 9multi nothing else. and I am at 4.35-1.352 in cpuz 24/7 setup
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post #3 of 48
cant unlink memory on a intel chipset
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post #4 of 48
Thread Starter 
What whe3ls said - but thanks for the input anyways.

Side note: I am considering a 780i motherboard since 8800GT prices are already hitting sub $150 with rebates all over the place. So people with nVidia boards feel free to comment on that also. Thanks!
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post #5 of 48
Quote:
Originally Posted by whe3ls View Post
cant unlink memory on a intel chipset
any divider not 1:1 is unlinked. so running a 1333 fsb and 333 is linked running 1333 and 400 is unlinked. This is the second time you have posted this miss information please stop
    
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post #6 of 48
watch the vcore on that e8400. Intel says max vcore is 1.36xx, the absolute max being 1.45, at which you'll kill your chip due to electromigration

In this case, vcore is more important than your temps (although temps are still important), so try to keep it no higher than 1.36xx for everyday 24/7 use.

It might also be due to your motherboard; you could also have a FSB wall. I don't own an e8400, so I can't really help with your overclock. Just watch your vcore, or you'll for surely kill your new cpu.

Quote:
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?
In regard to this, a simple fix would be a vdroop pencil mod for your board. They're fairly easy to do, and it would eliminate the vdroop from idle to load. For me personally, don't go above 1.36xx in BIOS not what cpu-z / speedfan reports. The reason for this is that the voltage is still pumping through the cpu, and henceforth could still damage it. That being said, check out the a pencil mod and you'll be able to gain more stability and not have to deal with this issue..
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post #7 of 48
Quote:
In regard to this, a simple fix would be a vdroop pencil mod for your board. They're fairly easy to do, and it would eliminate the vdroop from idle to load. For me personally, don't go above 1.36xx in BIOS not what cpu-z / speedfan reports. The reason for this is that the voltage is still pumping through the cpu, and henceforth could still damage it. That being said, check out the a pencil mod and you'll be able to gain more stability and not have to deal with this issue..
I haven't seen any mods for a DS3L...otherwise I would have done it too.
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post #8 of 48
What motherboard BIOS version are you running?

Try updating the motherboard BIOS.

45nm chips weren't compatible with the bios versions that shipped before the 45nm chip was introduced.

F8a might do the trick if you haven't already done so.
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post #9 of 48
Quote:
Originally Posted by aleiro View Post
any divider not 1:1 is unlinked. so running a 1333 fsb and 333 is linked running 1333 and 400 is unlinked. This is the second time you have posted this miss information please stop
I was under the impression that unlinked was the ability to change the fsb without changing the ram speed. With intel chipsets you can change the divider however which ever divider you have set as you change fsb the ram speed will also change. I dont think he is wrong in saying that you cant unlink your memory with intel chipsets, pretty sure it is you that is missinformed.


Oh and at the OP try to run memtest with your settings before you fire up your os. This will help factor out the NB and memory from being the culprits.
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post #10 of 48
Quote:
Originally Posted by MADMAX22 View Post
I was under the impression that unlinked was the ability to change the fsb without changing the ram speed. With intel chipsets you can change the divider however which ever divider you have set as you change fsb the ram speed will also change. I dont think he is wrong in saying that you cant unlink your memory with intel chipsets, pretty sure it is you that is missinformed.
Agreed. Whe3ls was correct, as is MADMAX22. This is indeed the 'definition' of unlinked.

And 'fixed' divider (1:1, 4:5, 2:3, 1:2) is a link.
    
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