B. Intel Core 2 Duo OC'ed at 3.8 ghz. 2 gig RAM DDR2 320 GB HDD Ati 4350 HD 1GB Asus P5KPL-AM SE
I pick "B".
1. Core 2 duo is a specific design dual core processor, and is designed to be slightly more efficient than the dual core.
2. The clock speed is higher.
depends what youre gonna use it for. pc A has a faster graphics card, so far gaming id say that one. pc B has a faster processor so for everyday jobs id say that one, cuz with a slower graphics card the faster CPU wont do you much good for gaming