anisotropic filtering and memory

[CJP]

Does anisotropic filtering take up space on a video cards memory or does it just take up more cycles on the cards gpu? I'm wondering because the settings in Doom 3 are pegged to certain amounts of memory. I've got a 128MB Radeon 9800np and I'd like to enable AF but I won't if it takes up too much memory, more than 128mb on Medium. Plus AF isn't enabled in the game until you get to the High setting for 256mb cards so do I take that as an indication that my card won't run well on Medium with AF?

I've got a P4 2.6ghz (400fsb) system and on the timedemo I get 38fps with no AF and 30fps with 8xAF.

 

[Johnbear007]

Originally posted by: CJP
Does anisotropic filtering take up space on a video cards memory or does it just take up more cycles on the cards gpu? I'm wondering because the settings in Doom 3 are pegged to certain amounts of memory. I've got a 128MB Radeon 9800np and I'd like to enable AF but I won't if it takes up too much memory, more than 128mb on Medium. Plus AF isn't enabled in the game until you get to the High setting for 256mb cards so do I take that as an indication that my card won't run well on Medium with AF?

I've got a P4 2.6ghz (400fsb) system and on the timedemo I get 38fps with no AF and 30fps with 8xAF.

Try it and play at the settings that are acceptable to you.

 

[BFG10K]

Does anisotropic filtering take up space on a video cards memory or does it just take up more cycles on the cards gpu?

It mainly uses more cycles and more memory bandwidth. Test the game out and see what you like better.

 

[CJP]

I went and tested it like you said and the game looks and plays alot better with af off (40fps as opposed to 30fps with it on). Thanks guys.