Quad Core and Futuremark?

I am not a big fan of benchmarks but use them to see if there are any changes after an upgrade.
Using 3DMark06 here are the results:
AMD X2 6400
At 3.2Ghz 12400
At 3.4Ghz 13407
AMD X4 9850
At 2.5Ghz 13386
At 3.0Ghz 14968
I stepped up the speed on the Video card a little for a score of 15401
http://service.futuremark.com/compare?3dm06=6635851
All tests were run with Vista 64
My question is; is 3Dmark06 biased to the quad cores?
I am not sure why I had higher scores with a lower clock.
Using 3DMark06 here are the results:
AMD X2 6400
At 3.2Ghz 12400
At 3.4Ghz 13407
AMD X4 9850
At 2.5Ghz 13386
At 3.0Ghz 14968
I stepped up the speed on the Video card a little for a score of 15401
http://service.futuremark.com/compare?3dm06=6635851
All tests were run with Vista 64
My question is; is 3Dmark06 biased to the quad cores?
I am not sure why I had higher scores with a lower clock.