Gas?

Its the amount of memory that your graphics card is allowed to use of your Ram. It uses that memory after all the memory that is built into your video card is used up.
 
On older boards you would increase the AGP aperature in order to utilize system memory for a larger 256mb or 512mb video card. The system memory would then be shared. The use there was due to the lack of the larger vpu chips seen now for freeing up cpu time.

The newer cards now with the larger chips see more work processed by the card itself. When problems were seen when increasing the size of the memory allotted the recommendation was to return to the factory 64mb default.
 
What is Graphics Aperture Size do? and it set 64MB

For AGP cards is was the amount of address space saved to use for texture storage but the more onboard memory your card has the less Aperture you need. I kept mine set to 128 but most test I have saw really didnt see any difference no matter the setting, unless you had a very small amount of memory on you card.
http://www.techpowerup.com/articles/overclocking/vidcard/43
 
Mine video card is 512MB and in Bios set 64MB default. It just only in Oblivion have problem when I set graphic too high. It will get texture flickering, with red and white dots flickering all over the screen and few 3D object just get little warps. I keep graphic detail down, and it didnt happen again.
 
You'll find a lot of games will start to goobers when turning up the anti-liasing and antisotropics. While your monitor and desktop see a high resolution like 1440x900 the game still has to be set at a lower one.

Here on an older build the aperture was set upto 256mb for a 256mb AGP card and lacked seeing any gain. Certain games then started seeing artifacts and that was returned to the default then.
 
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