You're going about it half-backwards. You pick the motherboard BEFORE the RAM, not all boards support all RAM.
Currently (and I don't believe ever) there are no dual i7 boards. The processor does not support a dual configuration. You need a pair of Xeons and a server board for that. Right now, the only LGA1366 Xeons supported in a dual processor configuration are the 5500 and 5600 series processors.
Repeat...........consumer Core i7 processors WILL NOT run in a dual processor board.
Faster than the speed of snot
and for the million hours that we were....well I'll smile and remember them all, then I'll turn and go....