The images below are 1600x1200. Didn't think about the size until it was too late; shrinking them makes the text unreadable.
This link shows the error as repeatable by just doing a start/stop.
http://www.eqsrecording.com/rig/prime95err.jpg
This is a two day torture test.
http://www.eqsrecording.com/rig/prime95tst1.jpg
I'll be doing a memtest86 over the coming weekend. If doesn't do anything, I'll do another torture test with the fsb upped from 200MHz to 209MHz.
Very strange.