i think there are plenty of cards out there if you are just playing halo... hell, my 32mb radeon 7500 in my laptop will play halo on full. granted, it doesnt look as nice, but it will still get great fps and look quite decent
I do want to say that you will need to upgrade your psu... basically anything you put in your system aside from maybe a 6200TC or a X300SE will run... but those cards won't be too much greater than onboard because they'll still use your system RAM (that's what Turbo Cache is)
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