AMD Sempron 145 unlocking/overclocking

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MinorMonster

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Dec 28, 2014
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I need some help regarding unlocking and overclocking my Sempron 145.

I'm currently using a Sempron 145 on Gigabyte 880gm D2H with 4 Gb DDR3 Ram
I recently tried to overclock the processor (default clockspeed is 2.8GHz). I increased it to 3.5GHz with ease. Then, I unlocked the second core with the default clock speed (i.e. 2.8 GHz), but my system crashed. The highest clockspeed it can attain at both cores without crashing is 2Ghz. (on windows 8.1 x64)

But, when I use linux (ubuntu 13.1 maybe), both cores run stable at 2.8 GHz.

Is there any way to get more than 2GHz at both cores on windows, or is 2GHz the highest I can attain ?

 
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Supernova1138

Supernova1138

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Mar 22, 2011
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Cores are usually locked for a reason, that second core likely failed quality control testing due to being unable to remain stable at 2.8GHz, so they disabled it and sold the chip as a Sempron.

As for why it's crashing in Windows and not Linux, what sort of stress testing are you doing? Is it simply crashing when it tries to boot Windows but not when you boot Linux? Windows is going to use more CPU resources than Linux, so Windows is more likely to crash on start if you have an unstable overclock.
 
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MinorMonster

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Dec 28, 2014
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Yes, it crashes as soon as I boot windows but on linux it remains stable at the time of boot. I haven't tried any stress testing on linux. The second core appears to be stable at 2 GHz because I've done medium gaming on it (Far Cry 3) for 6 hours straight wwithout any problems.
Any way to increase the clock speed without crashing ?
 
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Supernova1138

Supernova1138

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If you're running into stability problems above 2GHz, all you can do to try to push a higher overclock is increase your CPU voltage a little bit, and see if that improves your stability. Don't push your voltage too high though, otherwise you'll fry your CPU. I don't know offhand what the maximum safe voltage is for the Sempron 145, but that information should be available in its technical documentation or overclocking guides for your CPU.
 
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MinorMonster

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Dec 28, 2014
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I did increase the voltage (based on a brief online reading) upto 1.4v but that didn't change anything. It still crashed above 2 GHz.
Any other possible way to do it ?
 
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Supernova1138

Supernova1138

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Mar 22, 2011
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If you can't get it stable above 2GHz at the maximum safe voltage, then there is nothing you can do, that second core simply won't be stable above 2GHz. Core unlocking is never guaranteed, quite often the locked core won't function at all, or will have stability issues when run at higher clockspeeds. If you really need more CPU power you're going to need to look at buying a new CPU.
 
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