e6600 would be SO MUCH FASTER, in EVERYTHING!! no if, ands or butts about it.
and if you were to overclock them both. the 960 might hit 4.0++Ghz, but pump out some serious heat. The e6600 will probably hit 3.2Ghz+++ and run considerably cooler.
I've had both a Pentium D at 4Ghz and a Core 2 at 3.2Ghz, and the Core 2 is over twice as fast at pure CPU stuff, like SuperPI, and generally about 50% faster at everything else. (ie: gaming, etc)