P67A-UD3-B3 has major problems with turning on after going into sleep

[996gt2]

My system often has problems recovering from sleep, especially if it has been in sleep for more than a few hours.  I am using the P67A-UD3-B3 motherboard with the newest F3 BIOS.  My system passes 12+ hours each of Prime95 Blend, LinX, and Memtest86+, so I am relatively sure that it is stable.  However, when I try to turn on the computer from sleep, it sometimes will not turn on at all and will go into an endless loop of turning off, turning on for a few seconds, turning off again, turning on again for a few seconds, and so on.  

The only way to fix this issue is to reset CMOS.  But a few days later, the problem will inevitably happen again.  This is my second P67A-UD3 board (my first one was RMA'd for a newer B3 one due to the SATA bug).  The first P67A-UD3 I had also had the exact same issue with coming out of sleep, even after multiple BIOS updates and tweaks.

Can anyone shed some light on this issue?

Here are my system specs for reference:

Core i5-2500K @ 4.4 GHz (1.292v @ 100% load in Windows)
2x4GB DDR3-1333
Intel x-25M G2 80GB (newest 02M3 Firmware)-boot drive
Hitachi Deskstar 1TB 7200.C
WD 500GB 7200 RPM
Galaxy GTX 460 GC
Cooler Master Hyper 212+
Corsair GS 600 PSU

Windows 7 x64 Professional with latest updates

[Dark Mantis]

This is a known problem with an overclocked system coming out of sleep.

On another case of similar problems this is from Lsdmeasap

This is probably caused by CPU PLL Overvoltages, this is disabled on resume from S3 so you probably can't reach the same multiplier as you could with it enabled before you put the system to sleep.

I am not sure if they will be able to fix this, or if it's an Intel Microcode fault?   It's been a known issue for a while, so it may be something they cannot address.

[996gt2]

I have not enabled CPU PLL Overvoltage in order to reach my relatively moderate 4.4 GHz overclock.  PLL overvoltage is needed to go higher, but not for 4.4.  So since I don't have this feature enabled, what would cause the endless reboot loops upon coming out of sleep?

I read this review from Newegg regarding the P67A-UD3:

When all 4 memory slots are occupied and the power button is pressed, the computer enters an endless reboot loop as follows:
Power up --> after ~2 seconds power down --> power up --> after ~2 seconds power down --> (repeat)

When only both of the blue memory slots are occupied: everything is fine, computer starts up, windows is running for a whole day without rebooting.

When only both of the White memory slots are occupied: sometimes the computer enters a reboot loop when powered on and sometimes it starts normally but occasionally reboots

I have my DIMMs in the 2 white slots, but why would that cause an endless reboot loop?

[Dark Mantis]

I think that probably is the problem then as I have juist checked and if you are using only two modules they should be in the Blue slots. DDR3_1 and DDR3_3

You can see here on page 16 of your manual.

http://download.gigabyte.eu/FileList/Manual/mb_manual_ga-p67(ph67a)(ph67)-ud3-b3_v1.1_e.pdf

[996gt2]

But why should it matter which slots the DIMMs are in?  The manual suggests that you can use either 1/3 or 2/4 when only using two DIMMs.

This also leads to another issue.  If I ever plan to upgrade to 16GB RAM (4x4GB), then I must use the white slots, so wouldn't that lead to system instability?

[Dark Mantis]

It shouldn't matter which slots are used but sometimes it can make a difference when only using two. Try it and see. If you still have a problem then it isn't that.