Aperture size and RivaTuner

[DoomUK]

AGP Aperture is basically VRAM overflow into system RAM.

Half the amount of VRAM you have is the general opinion, i.e with 256MB of VRAM you should set it to 128MB, and so on.

 

[Apokalipse]

I cannot tell you where it is in Riva Tuner due to having an ATI card.

Rivatuner works with Nvidia and ATI

 

[regnak]

Well I still don't use it so lemme rephrase: I can't tell you exactally seeing as how I don't use RivaTuner.

Aperature is the ammount of RAM your video card is allowed to use once it's own VRAM is maxed out (as DoomUK correctly pointed out). Generally 128MB is what I have heard the best option. And changing it will not give you better fps untill you have used up all your VRAM and are using your system memory and in which case I'm not sure of the performance there seeing as how I've never put my card under such a load.