Well the CPU wasn't bad, I know that. The X2 ran at a constant 38 degrees Celsius under full load. I didn't change anything when I replaced the CPU, so everything else in my system is the same. Now I can actually play source engine games without random crashes. Before I sold my X2, I tried a fresh install of windows and all those fixes, and yet again it still didn't fix the problem. I had a theory that it could have been a problem with Nvidia drivers (even though I tried all different kinds, including the latest 80 series), but this still doesn't make any sense because other people with X2 and Nvida cards don't have these problems.
Really though, even if all those tweaks did fix everyone's problems (which they don't), it's still way to much work for something that should just be plug and play. Also, you may know lots of X2 owners with no problems, but I have seen lots of X2 owners with the same problems as me. Just go visit some hardware forums, and you'll see lots of threads with people complaining about the same problems I had. What really sucks is that I wanted to keep the CPU, because it was so great at multitasking. I'm going to try again in one year and hope that these problems are fixed.