Strange memory issue P9X79 PRO

[Rhyalus]

Hello All,

I have the latest BIOS loaded. I have 16GB of Corsair XMS3 1600 (CMX8GX3M2A1600C9) RAM, and with the safe defaults, the system works fine.

If I set the memory to 1600 MHz, the system also works great - passes memtest, benchmarks fine, etc. But when I try to put it to sleep or shut it down, it keeps coming back up. If I put it to sleep, it shuts down completely and I get the warning that Windows was shut down improperly.

I have checked all of the power settings and turned off all USB and network "device wake up" flags. Has anyone ever see this before?

Thanks,
R
(p.s., processor is i7 3930k)

[Rhyalus]

I think I resolved it... I can't be 100% sure that this was the issue, but I was not increasing the voltage on the RAM when I upped it to 1600 from 1333 - I left it on Auto.

I have since brought it to its rated voltage (1.65v) and it seems fine now.

The symptom still seems strange - it worked just fine when the system was running.

R