I have 4 of them and best stable with great performance is Asus P6T Deluxe, but is not good for OCing QPI ... higher QPI then 140MHz = freez, best mobo for OCing QPI is Gigabyte X58 UDP, MSI has many problems with compatibility of RAM and Ocing is impossible at all.

i965 Extreme + Asus best choice of Ocing with multiplier and super great performance, for i940 and i920 is best choice Gigabyte ... i am here stable at QPI 170MHz + Turbo mode = i920 @ 3,6GHz Prime stable.