For Doom 3 we set the ingame settings
to maximum other than quality which is set to medium.
AA/AF are controlled from the driver control panels.
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As with most Radeon vs Geforce comparisons
the Doom 3 results favour the Geforce card. Both cards
provided good IQ and playable framerates with no issues
and regardless of your purchase you’d be able to
play Doom 3, even with a little AA and AF.