What could be the cause of my problems?

[oakdad]

I am a newbie at this building your own computer so I followed the latest over clock and high performance
suggestions found here at Anandtech almost to the letter but my computer is rebooting about once an hour
and I do not know why or how to figure out why, please help.

Tagan 480W PSU +3.3V@28A, +5V@48A, +12V@28A
MSI "K8N Neo2 Platinum" AMD Socket 939 CPU
AMD Socket 939 Athlon 64 FX-53
4 Sticks of Crucial Ballistix 512MB DDR PC3200 184-pin DIMM
Seagate 200GB 7200RPM Barracuda 7200.7 SATA Hard Drive
.3 amp Enermax Adjustable Speed 120mm Cooling fan
.14 amp Jamicon 120mm fan
.25 amp ZALMAN 80mm fan with Quiet Mode Adapter for CPU cooler
Thermaltake PIPE101 Model CL-P0006 for cpu cooler
Pioneer 108D 16X Dual Layer DVD+/-RW
MSI 6800GT graphic card
8 usb ports
2 1394 ports
On board audio
wireless mouse and keyboard

The Bios monitoring software is telling me my I have the following. ~3.12v, ~5v, and ~11.68v ~43c on cpu 24c for the case.

 

[Zepper]

Usually random reboots are caused by RAM or PSU problems. First try upping the voltage on the RAM a bit. If that doesn't do it, run memtest and the free M$ memory tester - let them each run several passes and see what comes up. If no problems, try swapping out the PSU with a quality brand (I've seen some negative posts on the Tagan lately) and see what happens. Good luck.
.bh.

 

[oakdad]

Well my other computer has the same PSU so I swapped them out and everything is the same between the 2 so I can rule out it being a dud but it could still perhaps be to small I guess.

 

[HappyCracker]

If you have 4 sticks of RAM, you might try upping Vmem. It's quite a strain for it to have all slots populated like that.