I went through the documentation, and the board uses a standard bolt pattern. I've made comments to the contrary based on similar products, so I stand corrected. I'm not sure if the x62 can be used with it, though. The RAM is terribly close to the CPUs, and the CPUs are very close together. It's safer to stick with a standard server cooler for this type of board, generally. You'd also have a great deal of difficulty finding a case that supports two 280mm radiators as well as the SSI-EEB board.
Compatibility between server products is difficult enough to ensure without throwing consumer parts into the mix.