I run an AMD 9850 Quad and it works fine, I have 4 Gigs of ram since i am still running XP and not a 64 OS. Now after a few weeks of 3.1 coming out I am more stable with the 5, some lag in Dal and some of the more populated areas was having issues in IC but I have not gone there in a while, was also having issues when 2 toons where in Dal at one time it is not so bad any more, 1 the stability of 3.1 is way better and 2 I tweaked my wow set up was running off a single folder now running of 5 folders with Symlinks cut down on the lag and was able to spread my load around the 4 cores vs. only using 2. I set my affinity to 15 vs 3 and it uses all 4 cores so I am a happy camper, have not had a lot of time to get back to IC and check it out but I think I will be fine I will be doing some dailies there probably Friday or this weekend to see if I still have the lag issues.

Edit: 9850 not the 9750, but I am looking at upgrading to the newer AMD, perhaps build me a second machine, I have had AMD's for a while and I love them.