Well, after I transferred the RAM, Combo drive, and hard drive from my 733mhz to the new 867mhz, I ran into problems (of course). I got the three beep error code. I reseated the RAM and then the machine boots, slightly faster than the 733, but, then it locks up when I try to run flash player. I reset the machine and it works fine, flash player and all. It's noticeably faster on games and stuff. Woot.