InsideHW compares the high end QX9650 Intel CPU with the current low-end Q9300 in the Intel Core 2 Quad series.

Quote from the review: "This time we've compared two CPUs: Core 2 Quad Q9300 (this is the bottom model of current lineup) and Core2 Extreme QX9650 (the top model of current lineup). We have experimented with QX9650, bringing down its multiplier so we got whole palette of Core 2 Quad processors from Q9x50 generation.
To make evaluation of performances we have included in test even Core 2 Extreme QX6850 which is the top model Quad CPU from previous generation (65nm)."
Read the full review on InsideHW.