P7P55D LE & Dual Channel RAM problems

Hi there,

I am setting up my new i5 rig with the Asus P7P55D and this RAM:

Corsair 4gb DDR3

For some very strange reason, if I install the RAM into dual channel mode, the BIOS will only recognize it as 2GB (Slots a1+b1 or a2+b2) but I install the RAM into single channel (a1+a2, b1+b2) it will notice all 4gb, but CPU-Z reports it as being in single channel, which it of course is.

Could anyone please help explain why I can't run my RAM in dual channel mode? Do I have a buggered motherboard? :(

Hope someone can help!
3 answers Last reply
More about p7p55d dual channel problems
  1. You can also try other memory sticks with your new rig. Who knows, the memory you bought may actually be faulty.
  2. Or it could be a non-matched pair - look carefully at the labels, but that seems unlikely.

    Need to put one stick in and run memtest86 on it, then the other.
  3. I have this same problem, I belive the problem actually lies with the first bay being set to dedicated OS ram so I have 8 gigs in my computer but 4 is dedicated even though they are in a dual channel configuration i'm going to see if I can put a 2gig stick into the a1 slot which is my dedicated ram slot and move my 4 gig to the a2 slot and see if dual channel will work then
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