Darn .... Only BIOS 2704 would recognize Q9450 rev C1 ....

Core 2 Quad Q9450 (2.66GHz,1333FSB,L2:12MB,rev.C0,4 cores) ALL 2504

Core 2 Quad Q9450 (2.66GHz,1333FSB,L2:12MB,rev.C1,4 cores) ALL 2704