1 hour XTU stable, crashes upon stopping stress test

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1 hour XTU stable, crashes upon stopping stress test

Postposted on Sat Aug 23, 2014 9:58 pm

I am undervolting an i7-4500U in an Acer TravelMate P645-MG.

My dynamic CPU voltage offset was at -85.9375 mV. Occasionally when I stop an XTU stress test at that voltage level, the computer crashes. The stress test itself was stable.

As of now, I am running Prime95 at a dynamic CPU voltage offset of -84.961 mV.


On a side note, I plan on undervolting the CPU cache and the IGP. I also want to underclock the IGP because I have a dedicated GPU to handle gaming and I doubt movies would demand that much GPU power, but 'm confused by the "Processor Graphics Ratio Limit". Should I leave it at default or set it to "0.5x"?
UnfriendlyFire
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Re: 1 hour XTU stable, crashes upon stopping stress test

Postposted on Sun Aug 24, 2014 12:11 pm

I ran Prime95 for 13 hours on -84.961 mV, and when I ran Intel's driver update utility through their website, BSOD occurs.

Dropping down to -83.98 mV allowed me to use the driver update utility. Hm...
UnfriendlyFire
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Re: 1 hour XTU stable, crashes upon stopping stress test

Postposted on Sun Aug 24, 2014 12:47 pm

The CPU operating voltage might've been stable, but there's other voltages involved on the chip that fluctuate when loads are applied & stopped. Unless you have the option to adjust vdroop/loadline calibration, system agent, and uncore voltages then as ya found out raising the voltage a little bit is your only option.
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