Hi,
The most recent for that board would be the C3 revision processors in below link. The most powerful would be the Phenom II X4 965 Black Edition.
ALiveXFire-eSATA2 CPU support list
There are a few Phenom II releases after that latest(3.5) BIOS from Asrock, chances are some of them will work anyway, but no guarantee.
Check the link, C3 stepping processors :
List of AMD Phenom microprocessors
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Edited: 02/29/2012
at 10:40 AM
by go_for