I have a new 17" MBP (2.66, 4GB ram, 2 video cards, etc.). I have been having so many problems with this thing that I just did a full erase-reinstall. I've only loaded one thing so far ... World of Warcraft ... to test if I have any improvement--I don't. In WoW I'm running framerates of 20-40 (my brother is in the 70s on his 13-in MBP, and that only has 1 graphics card!). Outside of WoW, I'm getting pinwheels all the time with multiple windows open, and firefox is very slow to respond. I can't figure this out. Could one of my graphics cards be non-functional?