Mike I have a asus m4a88td-v evo board that has the same gpu and I am running mini collatz on it. It runs just fine on it...I think it takes 2.5 hours to complete the WU.
My gpu specs say:: (from the Collatz site)
CAL ATI Radeon HD 2300/2400/3200 (RV610) (341 MB)....
MY driver# = 1.4.556
My OS is XP PRO...
Specs from my Device Manager....
Driver date = 02/10/2010
Driver Version = 8.710.0.0
You might have to go with this older driver...Looks like they borked it on the new driver versions.