Why do you want a dual processor for gaming? Nearly all games dont support it so you'll only be getting half of your processing power as each core is clocked lower.
DP's are good for graphics work, not for gaming at the moment. AMD is better than Intel. I recently put together a machine for Graphics work but with a few comprimises for Gaming (like ditching the DP idea).
I had to seriously refresh my memory on whats what mostly with the help (and prob. eventual annoyance of these guys here). Anyway, look around a few newsagent type places and get a magazine like PC GAMERS Ultimate Rig Guide - helpful reading.
Also see this link
http://www.geoexpat.com/forum/posted...html#post47964