Yes, that processor is on the CPU support list with any BIOS.
http://www.asrock.com/mb/NVIDIA/N68-S3%20FX/?cat=CPU
The Athlon II X3 450 is an old triple core CPU. But with the right gfx card, it can still run games at mid settings at 720p resolution... and some at 1080p. Gaming online on a busy server may be a bit much for it to keep up with all the other players, but single player gaming should be fine.