Replacing old BIOS?

LHR Dovah

Honorable
May 2, 2013
25
0
10,530
OK, so I have come across some old, FREE pc parts (old-ish oem pc, and a GTX 550ti). My plan is to use that for a machine to play CS:GO so I can use a keyboard and monitor other than my laptop's (also so I can free up my laptop for studies xD). The CPU is an AMD Athlon 64 x2 5600+ processor, and I would like to OC it. Problem is, the BIOS on that PC won't allow me to. I was wondering if flashing the BIOS would be a good option, or if I should just leave it as-is. Adequate cooling will be present.

Thanks!