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My rules of thumb:
1. Never set AGP aperture size below 16 mb, as it can cause system instability and crashing.
2. Never set the aperture size larger than your system memory, is it will not be allocated and used anyway.
Basically, you'll be safe setting it wherever you want. Your card has enough memory that it is unlikely that it will have to resort to using system memory for textures and stuff like that. When your card does have to use the system memory, it will "lag" considerably and in general not be something you will enjoy.
Remember that if your application does need to dip into system memory, it can take as much as you have allocated which will leave the remainder for other software processes.
PC-133 can be had cheaply. I strongly suggest that you upgrade to at least 256 MB system memory.
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