The CPU is a i7 920 - so i need a 1156 board - but whihc one?
The i7-920 you want takes a 1366
Most of ones i can find, have 4 ram slots - there is no way that can be used as tri-channel for ram is there?
This is because you are looking at the wrong boards - socket 1366 have either three or six memory slots to use three-channel... The 1156 socketed boards are for the P55/H55/H57/Q57 chipsets - mostly i3 and i5...