Bad stick of PC3200 VX

Mack, I'm almost positive I have a bad stick of PC3200 VX Gold. I bought a 1 gig kit for the dfi system and I was having crashing problems. I ran memtest and I was getting loads of errors with both sticks installed, so I had pulled 1 stick out since this is a dedicated folding system anyways and really doesn't need a gig of ram. After I pulled the second stick out, the board ran flawlessly and the ram was passing memtest at 250 MHz ddr speed with 2-2-2-10 timings and 3.2v vdimm.

Anyways, I ordered another nf3-250gb board and bought a mobile claw from Tex right before I went offshore to work 2 weeks ago and the stuff came in while I was at work. I built the machine up last night before I fell off to sleep and installed the second stick of VX in the new setup. I started messing with it today and I have tried running memtest86 at 200 fsb at 2-2-2-10 timings (with errors), 2-3-3-10 timings (with errors) and now at default 3-3-3-8 timings (also with errors) and with 3.1v vdimm set. This is with the ram installed in dimm 1 of this mobo.

What do I do about getting an RMA on this?