My PC has recently started freezing, I've narrowed it down to the following facts (using DDR RAM):
- 2 modules in Single Channel mode, it takes some hours to freeze.
- 1 module in Single Channel mode, it takes some hours to freeze.
- 2 modules in Dual Channel mode, it takes about 2 minutes to freeze.
- 2 modules in Dual Channel mode, with memory speed underclocked, it takes some hours to freeze.
Memtest running for 10+ hours for each module shows no errors. I've also tried with another pair of RAM and the results are the same. Also, about 1 month ago, 1 HD and 1 memory module were broken and had to be replaced.
Are these good indicators of a faulty PSU? It shouldn't be a heating issue as the temps are ok and the PC has multiple fans working. Specs: Asus P5GD1Pro mobo, Pentium4 3Ghz (Prescott), BeQuiet! 350W PSU, Patriot 2x512MB DDR400 (also tried with Corsair 2x1GB), running Ubuntu.
Temperature readings: CPU 48ºC, MB 37ºC, graphics card 48ºC. Chipset heatsink passes the "finger test" and fans are ok. Using cpuburn, temperatures raise quite a bit but there's no freeze.
Additional info: in dual channel mode, if I boot into console-only mode, the system doesn't freeze right away, only after some time (say, 30 min). However, the system freezes immediately the moment I start the windowing system (Gnome).
The problem is still present with a different PSU and also after trying different components for everything except for the Motherboard and CPU. Between these two, perhaps it's most likely a motherboard problem.