I've also had stability problems in Win2K since I installed PC160 Tonicom memory. It's been getting worse as the days pass by. I don't want to blame the RAM straight out, I'm still trying to figure out what is causing the problem. My symptoms are BSODs maybe twice or more a day that appear to be random, and even happen when no applications are running. I also installed SP2 around the time of my RAM, and lately I installed the Via 1.32's and of course the latest BIOS, and I've added extra fans lately (maybe PS?), so I'm slowly backing everything back to see if I can isolate the cause. The problem is it may take 8 hours before I realize it's still unstable. I just got through running it at CAS 3 with the slowest timings, and well I still got a BSOD a little while ago. I also tried MD driving strengths of LO and HIGH, upping i/o and cpu voltages, and running w/ fail safe settings.
I'm using 2 256MB sticks and am currently running at 140 FSB (was also happening at 133FSB before). Everything runs great when it's not BSODing. I can push it real hard. It never locks up, just gets a save dump BSOD. I'm getting ready to pull one stick out and see if I still get them.
One way I can blue screen almost every time, is by trying to VNC into my machine. If it's the first few hours after a reboot VNC works fine, but if my machine's been running a while and I try to VNC into it I get a 0x000000050 BSOD which is related to paged memory.
Sorry I wasn't much help but maybe our problems are related and others might be able to shed some light on it.