Have played a 3v3 with large units and it seemed to run just fine on 1024x768x32 with settings on medium.

you were there on that battle CBR, how did it run for you? I think your sytem is similiar to mine:

Athlon 2600+
512k ddr ram
128 Geforce 5600

only a mid range system (no 12 incher here!) but seemed up to the task