there is not specific requiremtn for dual core motherboards to support dual core processors, you can run a dual cor processor on exsistign 939-pins motherboards as well, and this makes it definite that if u r using nVidia SLi, you can use 2 Gfx cards and a dual core processor.
why are you considering Intels knowing the current leakage in 90nm wafer. you have to get an air conditioned casing for that.
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"