DFI NF590 SLI - Ram Problems...Please Help

DFI LANParty UT NF590 SLI-M2R/G - BETA BIOS 11/10/06
AMD Athlon 64 3800+ AM2 Windsor @ Stock for Now
2x Corsair XMS2 512MB DDR2-800 PC6400 CL 4-4-4-12
NVIDIA GeForce 7600GT 256MB PCI-E x16 @ Stock for Now
Seagate Barracuda 250GB SATA2 7200.10 8MB 8.5MS
LG GSA-H22N DVD+/-RW Dual Layer DVD-RAM
OCZ GameXStream 600W ATX12V 24PIN SLI Ready Active PFC
NZXT LEXA Case 5 Case Fans and 2 12in UV Cold Cathodes
Windows XP Home SP2

Ok. I bought this ram and RMA-ed them cuz one stick was faulty. When I got the replacements I was having the same problems except this time both sticks work when I only use one, but when I put them both in (dual channel) I have all sorts of problems. (Im gonna try both in on single channel in a few minutes)

When I have both in (dual channel) it doasnt matter weather they're on auto volts or 2.1 like their supposed to be. If I put 1 stick in I have a few problems at auto volts but none at 2.1.

I have read that with high end ram you have to set all the timings and stuff manually and I havent a clue what to do. (hehe rhyming is fun)

So if you guys could lend some instructions or a link to some on how to set the timing for ram manually on my mobo.

I know where the setting are in the bios I just dont know what any of them do...

Thank you...

I second what Calyn said. I had a problem with my ASUS baord and the ram and had to RMA the board. Worked fine after that. If you can, try testing the ram in another computer and see if both sticks work together properly. If they do, then its probably not the ram, adn that would confirm a motherboard problem. If they don't, then probably something went wrong and they aren't talking to each other correctly.