Quick google search brought this up. http://www.gigabyte.com/support-downloads/cpu-support-popup.aspx?pid=3317
If that is indeed your motherboard, than no it doesn't support Bulldozer(aka the FX series processors) The majority of AM3 motherboards won't support Bulldozer because they require the AM3+ socket. It isn't any better for gaming than a Phenom II X4, the majority of games cannot utilize more than the 4 cores a Phenom II X4 has, and IPC if actually lower. IPC = instructions per clock, what that means is a 3.6Ghz Phenom II X4 is faster than a 4 core FX 4100 at 3.6Ghz. Bulldozer is primarily useful in only the 8 core variant for highly threaded applications, and even with higher clock speeds it isn't much faster than Phenom II X6 at most tasks.
Yeah, games only use up to 4 cores, and they don't even use the 4th core efficiently.
Based on an Anandtech CPU scaling article about games that can use 4 cores, going from a CPU with 2 cores to 3 core increases performance on average by 27%. Going from 3 cores to 4 cores yielded on average a 6% increase in performance.
If you do not use any applications that can must more than 4 cores, then that basically means the 5th to 8th will never be utilized unless you are running multiple programs (that can use multiple cores) at the same time.