ASUS Maximus Formula SE

[cadaveca]

Your guess is as good as mine. The box says:

"The ASUS EPU utilizes digitally monitor and tune the CPU power supply with improved VR responses in heavy or light loadings."

The chip on the mobo labelled EPU is the controller that we usually work off of for VDROOP and VCPU mods, and this board has a driver that installs for this "EPU" chip from the driver DVD. Based on what it is and what it is supposed to do, the driver may shown up as "SYSTEM" in taskmanager if it is actively working as described above.

The issue that GAR and I have is also not temps, or voltages...it seems either current- or FSB/cpu speed-related only. I'm working at eliminating speed as a factor..running 3400mhz @ 400FSB or 425 FSB does not "trigger" the problem, but 400X9 or 450x8 does, although, of course, voltage is higher for the 3.6ghz to be prime stable than it is for 3400mhz.


Setting 1.424v(reported by PC Probe) @ 3.6ghz and the behavior does not start immediately, but once temps hit 69c it starts. Unfortunately my cpu is not stable @ this voltage, so I was unable to see whether it's an intermittent thing, but this also makes me think it's current-induced, as obviously it's not the speed directly that causes the issue.


ON some other boards when the droop is real high due to the current load, the multi "bounces", which I myself blame on TM1 or TM2, and it's possible that this less than 100% prime load is a feature to overcome THAT behavior..i dunno..I'll have to extract another quad from yet another box to confirm that, as I have another quad that would do this "bounce" with more than 1.3v, or faster than 3.1ghz(again the bounce points to being current-induced by my testing).