After nrendering a project that's longer than 10 min. the PC is very jittery or buggy and this lasts until rebooted. It's got dual AMD 2600s with 1 GB of generic (no brand) ram; WD 7200RPM Caviar HDD (set to Ultra DMA).

Anybody else see this same jitter/instability after rendering and have to reboot their PC?

Could generic ram cause this instability?

Would it help to replace with Crucial/PNY?

Is there also any benefit in increasing the ram to 2 GB?
Thanks in advance