List:
Win XP
AMD Athlon X4 2.8ghz
ASUS M4A78 Plus mobo
MSI Radeon HD 5770 1GB 128bit
WD Caviar black 500gb 7200rpm
4GB RAm
EDIT* Overclocked to about 3.1ghz I think last time I checked.
Was a relatively cheap build even at the time, but so far has been great and more than enough of what I need (COD & BFBC2 etc)
Didn't know whether the new BF3 game would be such a drainer or not?
Kinda hard to tell as the beta was an old unoptimised build, but going by that you'd be looking at medium at most.