To be honest it'd run but not great. I have run it on a system with an ATi 5770 which is 50-10% better than your card (depending on game) but let's assume that CloD is not very optimized for ATi's and runs equally "fast" on your card then you can play it but you'll want to upgrade VERY soon.
http://www.hwcompare.com/1192/geforc...adeon-hd-5770/
Around christmas ATi will release the first generation of the new cards with rambus II etc. so it might be worth if you want to and can wait until then?