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1) The speed of the memory and memory transfer bus (FSB) is directly linked to how fast the CPU can do calculations. The CPU has to read from and write to memory what it has no room for in its internal registers or cache. That is where fast memory helps.
2) Both the CPU and GPU have memory to do work.
3) Some games or applications are more CPU intensive, such as simulators. When the game is CPU intensive then, obviously, the faster a CPU can do its work the faster the game can play. The CPU can do its work faster if there is no memory bottle neck; that is to say, if the memory it needs to access doesn't slow it down. Larger CPU cache memory (L1,L2,L3) help by letting the computer do computations without going to the memory as often or by prefetching things the CPU needs into these caches.
4) Some games depend alot on GPU features and the software it uses (Direct X 7,8, or 9) for performance. Where the game is greatly GPU intensive the CPU/Memory becomes less important; say for instance: anti-aliasing and anisotropic filtering. In such a case an older system can perform well.
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Let me say that the memory on your mainboard is not directly related to your graphics card performance.
It may make a difference
a) on how fast something gets sent to your GPU for processing (if there is a CPU/memory bottleneck)
... and
b) AGP aperture is also used to store textures should there be spill over from the Graphics Card memory
<P ID="edit"><FONT SIZE=-1><EM>Edited by Flinx on 08/06/03 11:27 AM.</EM></FONT></P>