Undervolt from recent past no longer stable...?

Crustaceous Soviet

Reputable
Mar 10, 2014
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4,510
Here's the relevant specs:
-Athlon x4 760k
-Gigabyte F2A85XM-D3H (rev1.1)
-Corsair CX430 v2
Windows 7 x64 Home Premium

I built my PC about 5 months ago, and for the first 3 or so months used a power profile which had 600MHz @ 0.600V as the lowest power state. (4.1GHz @ 1.23V as highest). I later acquired a 212 evo cooler and dialed in an overclock of 4.7GHz @ 1.42V. I've only been running this OC for a couple months and my temperatures have been kept well within thermal margins. However now, as I've tried to retest this undervolt, Windows flips me the bird and craps out a BCCode 124 BSOD within 10 seconds of dialing in the undervolt. It will -however- work one notch above 0.6V. Now most people would brush this off and return to overclocking, but there's this little thing called [strike]myself having a massive sperg[/strike] OCD; I was rather happy with that undervolt, and am not too enthused by this unpredictable negative change. So here's what I've tried:
-Clearing cmos
-Flashing bios to the other 3 availible versions
-Disabling the old 320GB ide HDD I recently added
-Various other minor variations with power settings

Anyways, it still won't click like it used to, which has me [strike]dismembering myself[/strike] slightly concerned about silicon degradation. Thing is, my OC has been quite moderate compared to other users of this chip, and hasn't been used all that long. I also haven't noticed any measurable differences at higher clocks. Could this be a software thing (windows has updated numerous times since) or is it hardware related (PSU/mobo increased voltage spikes down, or CPU electromigration).

I did accidentally run ~1.51-1.52V through my CPU at one point due to the minimalist bios not allowing for the fine tuning of turbo mode (which rather stupidly automatically bumps voltage up by >100mV for the highest state) whilst overclocking. However, this was only for around 30 seconds under low load until I realized, and the chip's maximum recommended voltage for usage is 1.55V ("kill voltage" for conventional cooling is >1.6V) so I doubt this would make any measurable impact.

Any thoughts? Your guess is probably better than mine.
 

JimF_35

Distinguished
It may be your power supply. Some power supplies do not support under volting. This is why you sometimes have to get a new power supply with 4th Gen Intels because they do this. How old is your power supply?

http://www.corsair.com/en-us/blog/2013/may/haswell-compatibility-with-corsair-power-supplies

It says "MAY BE". Probably should handle under volting.

It appears that it does have under volt protection...

http://www.cdw.com/shop/products/Corsair-Builder-Series-CX430-V2-power-supply-430-Watt/2967313.aspx