It definitely seems to be all about front side bus speed! I get similar frame rate with my Q6600 only running 3.36ghz, but with 478Mhz FSB compared to alot of others pumping high frequency into the CPU (3.6+ghz) with much lower FSB. It's far from perfect and whacking up GPU clocks definitely doesn't help all that much, even at 1920x1200.
Problem is at lower FSB frequency you begin to run into bus bottlenecks when using highish CPU frequency. It negates the increase in clock freq unless you raise the FSB accordingly to accomodate. FSB is a shared bus for all traffic so it's heavily impacted by too much data throughput. QPI on the other hand shouldn't be encountering this problem with its multiple point to point links.
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