Actually, for just gaming, Sandy easily beats out bulldozer. Even though the i3 is only dual core and the 6100 is six core, no game uses more than two cores, and so it's wasted. Bulldozer is actually pretty weak. The advantage is that you can overclock a 6100, and you'll also see it perform better when using multi-threaded apps like video editing and whatnot. For gaming, the i3 is better. Both are very, very capably processors, I just think the i3 is better for now
Crysis 2 with 560ti everything maxed:
i3 FPS: average 80 fps,
6100 FPS: average 70 fps