Here is an educated guess since I can't get to the Epox specs;
I would be stunned if the 6000+ 89w did not work in your MB. Both it and your current CPU were in the same timeframe of manufacture and (obviously) used the AM2 socket. No BIOS upgrade would be needed.
The 125w Version; it will fit, and it will power up, but, what speed it runs at I cannot guess.
Sorry, that's the best I can do.
Thanks much for the input. That was my guess as well.