If you are feeling adventurous you can always overclock PCIE.

We performed a few (quite a few) tests a few years back (2010?) and I ended up with a huge PCIE OC on a GigaByte X58-UD7. (that is Socket 1366 not 775)
(the thread is here in the storage section somewhere, it could have been in my "C300 vs Vertex LE" thread)