Phenom ii x2 vs i3-2100

i admit i dont know much about processors, so...

how is an i3-2100 faster than a Phenom ii x2 550? from my understanding, the phenom ii can be unlocked to 4core (better than i3 2core), and it had the same clock rate (3.1 GHz). And it is a lot cheaper. What makes the i3 a better one for gaming?
I3:
http://www.tigerdirect.com/applica [...] CatId=6983
phenom:
http://www.tigerdirect.com/applica [...] CatId=4433

please help me understand. also, if the i3 is better, is it a significant difference?

Hello mahin1islam;

The Phenom ii x2 550 might unlock to 4 cores. And might run stable. And you might be able to overclock all four cores and still run stable.
But you'd have to get lucky 3 times for all that to happen. Once for each core to unlock and run stable and once for the overclocking.

Should you choose Core i3-2100, its worth for gaming and Core i3-2100 consume less power (65W rather Phenom X2 550 85W). So, Core i3-2100 better than Phenom X2-550