I tried too i7 920 D0 ... Max Bclk on this board is also 222Mhz like C1 cpu.
To be prime stable @ 4Ghz under intel cooler i needed 1,5V Vcore ... but MAx temp was ~65° under 8 Threads Load.

Here is also my max 3dMark 2k6 on AIR.

This CPU needs a lot of Vcore.