Epox is gone and no cpu support list remains anymore.
The MF570 board can run a AM2 cpu and without a needed bios update I don't know if you could run a phenon I or not. That leaves the AthlonX2 6100+ as the fastest processor you could run. That processor is only 200mhz faster than the one you have and would be a waste of money if you buy it.
Now you say cpuz shows 2.1ghz. Perhaps the mulitplier is incorrect in your bios. It should be 14.5 and not 11.
if you want to play any modern games I'm afriad you'll need to save up for a motherboard, cpu, & ram upgrade at minimum.