Well, I wouldn't buy two 5960X's for it (or even one). While they will fit in the socket, and might work if you only filled one socket, they have no QPI links so the CPU's wont talk to each other; and the chipset may object to one without the QPI link, even if it isn't used when only one socket is populated.

You need to put Xeons in this board, any of the 2xxx-V3 series (the 2 indicating it is for Dual CPU boards such as this one) should work. The nomenclature goes on about the E5-2600 v3 family so it may be restricted to this series only.