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Overclocking an E6420

post #1 of 27
Thread Starter 
Hey all. I've got what I believe is a fairly poor E6420 for OC'ing. Previously I could never get 3.2ghz stable without resorting to 1.5v+ which just gets too hot for my stock cool. Now, I'm not going to rush out and buy an afetrmarket cooler any time soon so I'd like some help. I recently Upgraded my bios from 401 to 608 which seems to have helped. But so far I can get 2.66ghz stable at 1.3v. And Previously 3ghz took 1.39v, but anything after 3ghz took majoy voltage increases. What I dont get is that anything below 3ghz works with nice low voltages. But after that it starts need 0.1 extra for another 200mhz. Has anybody got any ideas thatd help me out?
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Clevo P650RP6-G
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post #2 of 27
Remember to raise your MCH voltage, as well as VTT/GTL voltage. All of those help to get better FSB's out of your chip.

In my case, with MCH, VTT, and GTL voltage all at stock, it took me 1.5volts to get to 3ghz. Raising all of them a bit, mostly the VTT and GTL voltage, allowed me to get to 3.32Ghz at only 1.46volts.

Also, keep in mind that some chips just don't overclock as well as others, and will get stuck before you can get them too far. For example, no matter what I've tried to do, I cannot get my chip stable at all past 3.4Ghz, even though it's 24/7 stable only 80Mhz slower.
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post #3 of 27
Thread Starter 
"MCH, VTT, and GTL voltage" what in earth are those? The only voltage options I have are Vcore, Memory and Northbridge
Clevo P650RP6-G
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Clevo P650RP6-G
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post #4 of 27
a little higher NB will probably help.
post #5 of 27
Thread Starter 
Quote:
Originally Posted by ChielScape View Post
a little higher NB will probably help.
The voltage options i have are ~1.3, ~1.5 and ~1.7 although apparently 1.7 shouldnt be used for 24/7. And I've tried 1.5 and its had no effect.
Clevo P650RP6-G
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Clevo P650RP6-G
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post #6 of 27
Make sure your NB is below or at 40c, and raise the voltage a touch. Nvidia NB's can cook like a George Forman grill. Extra cooling, will help maintain stability and some extra mhz.

Q- what are your load temps, RAM timings and voltage at?
post #7 of 27
Thread Starter 
ram timings are 4-4-4-12, 2t. voltage for ram is 2.1.

At 2.66ghz @ 1.3v load temp is 42C
Clevo P650RP6-G
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Clevo P650RP6-G
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post #8 of 27
Are you quoting BIOS settings for voltage, or using software in Windows to read voltage? Reason being, voltage droop. 1.3v in BIOS = ~1.24-1.27v in Windows..etc. So consider that..RAM voltage has the same problem..drooping .2-.5v sometimes more, depending on PSU and mobo.

I was able to run a steady, Orthos stable OC of 2.8ghz on my e6320, using 1.32vcore in BIOS, to equal a 1.3vcore in Windows. Maybe your droop is killing your OC...
post #9 of 27
Thread Starter 
i did a vdroop mod on my p5n-e readings from both bios and windows are exactly the same
Clevo P650RP6-G
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Clevo P650RP6-G
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post #10 of 27
very nice...maybe your CPU just needs a touch more vcore?
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