Quote Originally Posted by pevergreen View Post
6 identical sticks. Purchased as two 3packs.

Two of these:
G Skill 6G(3x2G) DDR3 PC10666 9-9-9-24

Motherboard:
Gigabyte GA-P55-UD6 P55 DDR3 PCI-Ex16 SATAII RAID 2xGLAN SLI Crossfire.


Couldnt be a power thing could it?
Could be, what PSU do you have?

Also, have you checked the RAM is on this list?

Your board's spec lists the following:

Memory:
6 x 1.5V DDR3 DIMM sockets supporting up to 16 GB of system memory
Dual channel memory architecture
Support for DDR3 2600+/2200/1600/1333/1066/800 MHz memory modules
Support for non-ECC memory modules
Support for Extreme Memory Profile (XMP) memory modules
But nothing jumps out at me from that.