MSI K9N SLI Platinum nForce 570 SLI - RAM issue

I have just built a new system for a friend with the following specs:

AMD Athlon 64 X2 4200+ 2.2GHz Socket AM2 1MB
Corsair TWIN2X 6400 DDR2 2048MB CL5 2X1024A-6400 Dimm's
Fortron Source Epsilon 600W
MSI K9N SLI Platinum,nForce 570 SLI (MS-7250),ATX, Socket-AM2,2xGbLAN,DDR2,Firew,2xPCI-Ex16
NEC DVD±RW burner, ND-3550A, 16x, Dual, Silver OEM
Point of View GeForce 7900GT 512MB, GDDR3, PCI-Express
Sony Floppy Drive, 3,5" 1,44MB Silver Floppy Drive Internal
Seagate Barracuda 7200.10 320GB SATA2 16MB 7200RPM

I've set the voltage on the RAM to 1.9V, i got this from this data sheet : http://corsairmemory.com/corsair/pro...X2048-6400.pdfand set the timings manually

When i run memtest i got 166,000+ errors before 1 pass had finished.

When i run memtest with 1 stick at a time in any slot at 1.9V i get no errors.

So far I have gradualy uped the RAM vooltage to 2.05V, which reduced the number of errors to 96. Before i try 2.1V is there anything else i could do that would help, leaving RMAing to the last. Would reducing the RAM frequency from 800MHz help? Or is there something I haven't tried yet

The timings are 5-5-5-15 right? And i dont think 2.1v will hurt them, quite possibly something with the mobo.

i've been running at 5-5-5-12 as it said in the data sheet. WOuld be nice if they specified the AMD timings will try that.

good news the PC is now running stable @ 5-5-5-12 @ 2.1V. Thanks for all your help

The Cutie,
I am looking at purchasing the MSI k9n platinum motherboard. The non-Sli version of what you have. I have been getting mixed signals about the RAM to purchase for this board. Did you consider DDR2 667 also, or just the 800?

I only considered the 800 as I was hoping to get the best performance out of the PC. It got 5700+ in 3D Mark 06 (cant remember the small digits). So if you can get the 800 is what I think and check out MSI site to see what RAM has been tested with and works. Might have saved me a lot of bother if I had checked. One more piece of advice, might be better to stay away from the 7900GT's as there is an unusally high amount to them been RMAed. Looks like they are been pushed to hard or something. Hope this helps