Asus P8P67 Pro Sleep Mode Issues

I am still having annoying issues with sleep/resume and my Asus P8P67 Pro system. 

While digging through the BIOS settings to underclock my RAM speed (as suggested as one possible resolution) I cam across an ‘EPU Power Management’ option (beneath the RAM settings- of all places)- and disabled it. 

I will not know until morning if this fixes my standby issues- but I will try to update my findings over the weekend.

Update:  The EPU power setting had no effect; it may actually be having more issues than before. 

On a hunch, I decided to look at the memory to see if it may be the problem.  I was running 2x4GB and 2x2GB sticks for 12GB of RAM; I pulled the 4GB modules and replaced them with some older 2GB modules (so now at 4x2GB = 8GB).  I reset the BIOS to ‘optimal’ settings and my PC appears to have stayed online for the night; I will need a few more days to confirm, but initially this looks promising; 9+ hours and no sleep issues!

Update #2:  It looks like my RAM was the culprit!

I replaced the 4GB modules with 2GB modules and I have been almost a week without a sleep/shutdown issue.  (I did have one lockup, but that was probably a normal Windows issue).  I am nit sure if it is the 4GB module size or the RAM is defective, but I am currently running:

4x Corsair XMS3 2GB PC3-10600 1333MHz 9-9-9-24 (Kit of CMX8GX3M4A1333C9)

I replaced

2x Corsair XMS3 4GB PC3-10600 1333MHz 9-9-9-24 (Kit of CMX8GX3M2A1333C9)

I believe my memory was banked correctly; 4GB modules in slots 1 & 3 and 2GB modules in slots 2 & 4.

I am not sure if I want to try just the 4GB modules to see if the issue returns or if I should just be happy with it running as is.  I was hoping to eventually go to 16GB and onto 32GB (when they get around to making non-registered 8GB DDR3 DIMMs)- so I am kind of at a loss for what I want to do…

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