Basically the same as an Athlon 64 X2 vs Core 2 Duo.
- Cache size differences
- Clock speed differences
- Dual-Channel RAM speed differences
- Power consumption
- Video card + Price diffs (The Turion 64 X2 low end 3D video beats Core 2 Duo low end 3D video as they have faster memory access + higher memory throughput).
- Add a 7600 GS/GT to both systems though, and the Core 2 Duo will win in games.
Actually at last check the Turions were slightly better if you're looking for battery life. But only slightly. For...ANYTHING else, C2Dm is better, and that's the sad truth. It's not even a contest, is why it's sad.