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Athlon 640 II x4 overclock to 3.6GHz - Page 5

post #41 of 46
You're on water? Up to 1.5v should be safe. Mine goes up to that under load and it's fine, on air cooling. The 640 is also a C3 part I think, so it should go further than 3.6GHz
post #42 of 46
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:/ I had to get it back down to stock, I have no idea what's wrong but I think it's my mobo (it was second handed. . . ) but I was in desperate need.
    
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post #43 of 46
OC one thing at a time to prove its stable. The ram NB and HT need to be all at defaults. There is little to gain by upping the ram speed.

My best on this chip is 14x 250mhz, 1.385v.

Did you reset the CMOS/bios after you installed everything ?
post #44 of 46
Just start over.

Reset all setting in the bios and start from scratch.

First change - Turn off the Throttling devices so you can see what is going on in CPU-Z Disable Cool and Quiet or C&Q and disable C1E which will be located in advanced bios settings, not core calibration area.

Second - Figure out what the maximum reference clock is for the CPU. To do this, turn all the multipliers to the lowest (CPU,HT NB mem ratio), then take up the FSB up 6mhz at a time, boot into windows run 3 passes of Prime until you are unstable. Once you are unstable, bump up the core voltage a little at a time, not to exceed 1.55v considering you got your mobo from a desperate need situation. Do this process until you are no longer stable at 1.55v, then come down an extra 6mhz from your highest stable, and jot that figure down, that would be your highest FSB. (If it ends up being 250, then the absolute max you would get out of the chip would be 250x15=3750, if it is 262 then 262x15=3930, etc.) In a perfect world you would turn the multiplier up at this point and be done, but all the other things in the system have be be factored into the situation as well, because 4ghz with half speed HT and Half speed Ram would perform way below stock.

Third - Reset everything again, leaving the step one Items turned off, then bring up the NB multiplier to max and go through the increases in the FSB like earlier, increasing voltage to the CPU and NB as instability is discovered. Find Max, jot down. Do same for HT.

Fourth - Memory, this really can wait till the maximum oc is found, just leave at stock for now, but bump the voltage up to atleast 1.5. My ram is 1.65v and to oc it I am at 1.71 for 7-8-7-23. <b>xd_1771</b> will give some very good advice once you get to the fine tuning of the ram part, heck he will give great advice at every part.

Fifth- CPU Max out, Same as before, reset all and turn off C1E and C&Q, turn all multipliers to min, except the cpu, then start the increase of the FSB to max out, prime testing the setup of course. Once you are there:

Six - Reset all again, and start to mix it all together, the first steps where to see the capabilities of the individual components, mainly looking for weaknesses. Sometimes the weakness can be strengthened by adding a little extra voltage to the component, sometimes its just the Achilles heel. This time, start ocing like you mean it, a little bit at a time, adjusting each component to compensate for its use. NB and HT work best around 2000, you can get more out of these later once you get a happy clock.

Keep at it and try not to get too much voltage, it kind of sucks having to run the cpu at 1.52vcore all day long just so You can say you have a 3.6ghz processor. Also, when you are all done, you can turn back on C&Q and C1E to save you a little heat when you are sitting idle.

Good luck, and dont be fooled by the C3 stepping for this particular Athalon its just marketing it seems, its a true propus core, unlike many of the 620,630, and 635's that are disabled Deneb's, which oc like mad crazy. I have heard 2 stories about 640's getting great oc's ( 3.75-3.8) and that is it. Everyone else, 3.6GHZ max, and most people drop down to 3.5g after a few months because they are tire of the random BSOD.
Edited by cook - 4/14/11 at 2:07pm
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post #45 of 46
There are PERFECT guides in this forum's AMD section, just read and you'll understand everything and get a perfect OC
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post #46 of 46
Sorry to be blunt, but if you just read the guides already posted (or even googling it), this thread would be unnecessary. But, regardless, Cook's advice is what I would have said. FYI, you shouldn't arbitrarily pick a overclock and try to get there. All CPUs are different. For example, cook got his OC to 3.6, but my max is 3.58 (and that is at 1.55V). Like Cook said, you first want to find your max OC, then go from there. Obviously, there is no one right way to OC your CPU since there are alot of moving parts.
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