I'm using an E8400.
1st one was Q748, pretty yucky.
Max fsb was 530 but need 1.475v for 4ghz and 1.6v for 4.2ghz.

The 2nd one is better.
1.27v for 4ghz, 1.5375v for 4.5ghz.
Have yet to test max fsb on this one.