Michael you do know that the Core 2 Duo is crap and crippled compared to any other real Core 2 Dual right.

and yet again you dont run even a basic x264 HD CRF 18 encode clip test...., that would show you how crap/crippled the Duo is as theres not likely any other app thats more assembly tuned to each CPU and its capability's than x264 on the planet.

so make x264 a standard test in your Phoronix Test Suite And Actually Run the thing and include the results on all your cpu's etc to compare.
and make sure you use a current compiled x264 1745 version and ffmpeg from master at least, not some antiquated version in most current distro releases