rrcottingham Posted December 17, 2011 Share Posted December 17, 2011 I was hoping for some advice. I am doing a new build with a Corsair AX850 and a EVGA X79 FTW. It is all behind a nice APC UPS. I just can't get it stable. It always freezes or reboots within say 1-30 minutes. After testing and swapping several components (e.g. video card, memory, drives, many reinstalls), I am starting to wonder about the power supply. I noticed quite a bit of varyation in the voltage within the BIOS. So I fired up CPUID Hardware Montor as it remembers the min and max voltage. I have seen 0.2V varyation (max - min) so far that I have noticed. I was under the impression (perhaps wrong) that the 12V rail should not vary more than say 0.05V. Could anyone help me understand what variation is expected and what it really means? Link to comment Share on other sites More sharing options...
peanutz94 Posted December 17, 2011 Share Posted December 17, 2011 You are allowed 5% variance. So 11.4 to 12.6v will be within spec. And that 5% is applied to 3.3 and 5v rails as well. Your voltages seem fine. However you can't trust the BIOS or software to be correct when it comes to PSU voltages. Any chance you can test it with a multimeter? Have you tried to run your computer with out the UPS?? Link to comment Share on other sites More sharing options...
VagueRant Posted December 20, 2011 Share Posted December 20, 2011 Having the same issue, rrcottingham. X79 FTW and AX850 random lockups and loss of usb power. Didn't check voltages in HWinfo but in the Bios it is fluctuating between 12.24 and 12.16 . Post back if you find a fix, I have tried everything I can think of. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted December 21, 2011 Corsair Employee Share Posted December 21, 2011 12.24-12.16 is perfectly fine. There is a 5% -/+ allowance. Thank you . Link to comment Share on other sites More sharing options...
peanutz94 Posted December 21, 2011 Share Posted December 21, 2011 This seems more like a MB issue to me. You both have the same MB;s and same exact problem. Have either of you guys been over to the EVGA forums and asked around there? I realize you both have the same PSU too, but what you guys have posted for voltages and the near zero amount of fluctuation, it has to be another problem.Your talking just a hair over 1/10th of a volt. and that is nothing! I have seen 0.2V varyation (max - min) so far that I have noticed Same here, not enough of a fluctuation to be concerned about or enough to cause instability. If you saw over a whole volt drop, then i would go ahead and hang the PSU! Link to comment Share on other sites More sharing options...
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