Most AM2 Motherboards Not Phenom Ready | Tom's Hardware
"Board Revision: 1.04
Installed BIOS: 0702 (2007-06-20)
Upgraded with: 0904 (2007-11-08)
The M2 Crosshair, being an enthusiast motherboard, has received multiple new BIOS versions during the last months. We downloaded version 0904, which adds Phenom support, adjusts Cool'n'Quiet support, bringt an improved CPU auto-detection algorithm and AGESA version 220.127.116.11 (AMD Generic Encapsulated Software Architecture).
The BIOS update worked: While it was not possible to start this motherboard with Phenom using the initial BIOS version 0702, the board recognized the Phenom 9600 and worked properly with BIOS version 0904."
should be fine with the new BIOS