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AMD Athalon II X4 640 @ 3.4 As good as it gets?

post #1 of 85
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I am stuck and want to get a few more mhz out of my processor. I am currently at 3.4ghz and and cant go any further to stay stable. I upped my ram voltages from 1.6 to 1.65 and that helped me be stable at 3.4 with p95 overnight. How far can I take my processor voltages? The setup runs very cool, what should my concerns be with upping the voltage to the CPU or the NB? Here is what I have currently.

Any suggestions?

Validation

Temperatures and Voltage at Idle

Temperatures and Voltage at Load
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post #2 of 85
You need 1.44v to get 3.4 GHz?
    
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post #3 of 85
Thread Starter 
That is the default in bios
BullDriver
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post #4 of 85
Been following lots of 620-40 threads, and this seems to be pretty close to the average clocks, mostly from 3.4-3.6, in a few rare cases higher. Now the question is do you want to sacrifice your nice cool temps and start upping the volts. I'd pump it up to 1.5/1.55 ish, and just see how high you can get her to go, then start backing down if the temps get too high with the fairly small tx3, and settle with the happy medium =)
Edited by Fletcherea - 1/4/11 at 10:26am
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post #5 of 85
I got mine up to 3.6Ghz with 1.495Vcore which was Intel Burn Test stable

She wouldn't budge after that, no matter how much Vcore I gave her
post #6 of 85
Thread Starter 
Quote:
Originally Posted by MR KROGOTH View Post
You need 1.44v to get 3.4 GHz?
Thanks for saying that, I went in and lowered V core to 1.4 and did about an hour of prime and seem to be getting lower temps and the same stability. I can and can't believe I overlooked that.

Quote:
Originally Posted by antuk15 View Post
I got mine up to 3.6Ghz with 1.495Vcore which was Intel Burn Test stable

She wouldn't budge after that, no matter how much Vcore I gave her

I feel that wall, I have got it up to 3.58 and shot a CPU-Z validation but had very little stability.

So far Everything after 3.6 makes me reset the Bios. I think next time I will be going with an all red AMD Rig, Bulldozer whenever that comes out and a slightly more refined chip-set. I just like the Nvidia video cards and have always wanted to try SLI. My Christmas bonus is a little late but I found a second gtx465 on Tiger Direct for 139.99 and it will be mine!!
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post #7 of 85
nice.. waiting for my second card {not close to as good as yours} to come in to try sli as well. also have you lowered the multi for the ht link? if not it could help a lot, i have seen some mobos not do well over 2k ht.
post #8 of 85
The maximum voltage is 1.55V. That's what it took for me to get my Athlon II X4 620 stable at 3.5GHz. 3.41GHz took me 1.5V.
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post #9 of 85
Thread Starter 
Quote:
Originally Posted by The Fryer View Post
nice.. waiting for my second card {not close to as good as yours} to come in to try sli as well. also have you lowered the multi for the ht link? if not it could help a lot, i have seen some mobos not do well over 2k ht.
Yea, I keep it at about 2k I think right now its at 2040.00 according to the validation. NB Freq is a 2493.9. It should be at 2400.00 but I will try backing that down.
Edited by cook - 12/28/10 at 4:07pm
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post #10 of 85
If you want to overclock that CPU you must change out the stock cooler. The stock cooler on the 640 doesn't do a good job. I'd recommend a Hyper 212+, Relatively cheep but cools nicely. I got to 3.6 stable at 1.5v, with your board you should be able to reach about 4ghz if you get a good cooler.
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