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Looking to undervolt/overclock my A6-3400m laptop

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February 16, 2012 4:33:07 AM

I've been looking around about a good procedure to undervolting/overclocking the A6-3400m I have in my Lenovo z575 laptop, but my searches show either people reporting their final results, or others saying how things like K10stat works. The things I'm looking for involve how to start the undervolting/overclocking procedure, what are the highs/lows that the voltage should be around for each frequency step, etc. Because every CPU is potentially different, I won't necessarily have success with copying someone else's final measurements.

I understand that undervolting should be done first, but how should the process be done? Start at the lowest clock frequency (for all settings?) and find a good low voltage? How will I know when I shouldn't go any lower? When I'm ready to go up to the next higher potential frequencies, how should I deal with the voltage? How much is too much voltage? How will I know what is too much? As it is right now, k10stat reports these current stats for all cores...

B0: 2300 - 1.4125
P0: 1400 - 1.1875
P1: 1300 - 1.1250
P2: 1200 - 1.0625
P3: 1100 - 1.0375
P4: 1000 - 1.0125
P5: 900 - 0.9875
P6: 800 - 0.9500


Just looking at other's "stock" voltages, mine seem to be much a bit over the usual, which I kinda find odd. Anyways, once I find some good undervolting stats, how should I go about with overclocking the APU? My plan atm is to set B0 to 2.6Ghz, with P0 to 2.0Ghz, and a drop by 200Mhz for each following until P6 which would be at 800Mhz, but I'm hesitant on how to do that without some idea of how to do it. How should testing be done?
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February 17, 2012 7:40:57 AM

Overclocking laptops is generally a bad idea due to poor cooling. Your asking for quick hardware failure, very quick. I understand thats why your looking at undervolting it, but chances are you won't get much of an OC if any from doing that.

And most prebuilt computers have the bios locked down so you can't OC, laptops included. So go check that out before you get your hopes up.

Best solution

February 22, 2012 10:39:20 PM
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DiscostewSM said:

Just looking at other's "stock" voltages, mine seem to be much a bit over the usual, which I kinda find odd. Anyways, once I find some good undervolting stats, how should I go about with overclocking the APU? My plan atm is to set B0 to 2.6Ghz, with P0 to 2.0Ghz, and a drop by 200Mhz for each following until P6 which would be at 800Mhz, but I'm hesitant on how to do that without some idea of how to do it. How should testing be done?


Some of the safer test are done by setting all the P6-P0 and B0 speeds and voltages to the same value, then testing stability and temps at 100% CPU and GPU (the one in the APU) load. That's for all the different P-states, so might as well stick with using only 3 different values; eg. 400/1400/2400 MHz.

A faster but slighly less safe way;
Make a note of the temps you're getting at the default clocks.
Then set both B0 and P0 to 2300 and 1.2000 volts, while runningat 100% (eg. some combination of , 7-zip benchmark, prime95, furmark, x264 encoding, passmark)
Lower the voltage by one step every couple of minutes. If you get to 1.1000 volts at 2,3GHz , great.
Lower the voltages even further, or increase the speed slightly.
P6 should be stable at 400 MHz at around 0.65 volts, but obviously YMMV.
1400 MHz @ 0.90 V +/- 0,05 V ; change voltage by 0,05 for every 200 MHz.

For an actual overclock, try 3000 to 3200 MHz; 1,2 to 1,35 volts and monitor the temps on all available sensors.
Chances are that the fan won't start running at full speed until the CPU hits 80 C; although staying under 70 C is more comfortable, at least if running at high loads 24/7.

Of course if you have a good external laptop cooler pad+fan, the temps might be lowerer enough that you can increase the volts to 1.4125 or marginally higher and see how high clocks you can get. The 1.55 voltage is probably way too high unless you transplant your laptop mobo+cpu into a htpc/desktop case with a proper (heavy) cooler and 1-2 large fans.
March 3, 2012 11:15:41 PM

Best answer selected by DiscostewSM.
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