I have been having the same problems with the exact setup for 6 months.
I have tried all the bios updates voltages etc etc. Sometime it would detect all 6 gigs sometimes it would not.
There was a lengthy thread on another well known supplier forum with many other having the same problem (Not sure if im allowed to link it).
I used to hold the del key to drop into the bios then restart pc and it would show all 6 gigs but always seem to suffer from the odd crash which has recently got alot more frequent and also failed Memtest86 so was RMA`d.
Im hoping a new set of sticks fixes these issues, If not I suspect the Mboard is bad or just not 100% liking this mem.
