might get a better response if you put this in the right place not under AMD. I have never heard of a Q9505???? A Q9400, Q9550, Q9650 sure but not a Q9505
Q9505 is a 2.83 ghz, 6MB L2 Cache, 45nm technology consuming 95w having Fsb of 1333mhz. Q9505s has the same specs but has Intel Virtualization technology. At stock speeds the Q9505 beats the Q6600. When overclocked, both the cpu's, Q9505 and Q6600 to 3.20ghz at 1600 Fsb, i think Q6600 beats Q9505 due to the fact that Q6600 has a little more cache, 2mb extra than Q9505.