Sir' First of all i wandrer why my nv gt220 is smaller than gigabite gt220 .And can i increase my Grafics card's performance by overclocking it on my own.
1. Different companies.
The GT 220 is a really slow card even overclockig it will not gain you much performance its comparable to the old 9500GT which were not good gameing cards. But try useing EVGA precision or rivatuner to overclock it. Then test it with ATItools