My system has been a little flaky lately and I can't really nail down the source of the problem. I passed 4 hours worth of prime95 yesterday, but my internet has been finicky lately (intermittent connection) and this morning my system rebooted while I was writing an e-mail. Here is my setup:

Chaintech VNF4 Ultra w/Zalman chipset heatsink (6/3/2005 bios)
Venice 3000+ @ 2.43 (9x270) w/modded 7700ALCU
4x 512mb Twinmos PC3200 @ ddr450 2.5-4-4-8-2T
Gigabyte X800 Silentpipe @ 400/1060

All my temps are great. I'm also having no trouble passing memtest so I'm assuming it's not my new memory. Should I switch my Nforce4 drivers back to 6.53 (I have 6.66 installed)? Should I up my northbridge voltage? Should I revert back to an older bios?