I'm in the process of upgrading my Gateway 5404. It has a Pentium 915 D 2.8g processor. So far I've installed an additional gig of ram, for a total of 2gigs. I upgraded to an Ultra 650w psu, and an HSI Radeon 4850. The only game I play as of now is WoW. I'd like to find a motherboard that will support an additional 4850 in Xfire, with an AMD processor. What mobo and cpu would you recommend? Also, would it be worth it to use ddr3 over ddr2? I'm not looking for the most expensive option, just the best bang for the buck. Also, is 2x 4850s overkill for WoW? Thanks in advance for the help, it's appreciated.