Is this graphics card good/average/bad for gaming?

Hi, I -think- my graphics card is an ATI Radeon HD 3450 from what I understand of how to check. I have no idea what this means though, is it any good for gaming? I only ask because I've just tried Warhammer 40k: Dawn of war 2 and even on the lowest settings I'm getting huge lag, to the point where... show more Hi, I -think- my graphics card is an ATI Radeon HD 3450 from what I understand of how to check.

I have no idea what this means though, is it any good for gaming? I only ask because I've just tried Warhammer 40k: Dawn of war 2 and even on the lowest settings I'm getting huge lag, to the point where it's not worth playing.

Can anybody tell me if it's my graphics card? How bad is it if it is? How can you tell a good one from a mediocre one?

Thanks
Update: I have:

Intel core 2 Quad CPU Q6600 @ 2.40GHz
4GB RAM
32-bit Windows vista home premium OS
2 answers 2