What is the best RAM stress test? I run SP2004 and get no errors on my newly installed Crucial Ballistix, but when I try to swap a few gigabytes between hard drives, I get the BSOD.

So I'm guessing that the RAM, as the new component in the system, is causing the error. Does another program more thoroughly test the RAM?

Try Memtest86+

Memtest86+ is a good start. Run Orthos or twin instances of PRIME95 under windows to stress test.