The GPU data width. These never have to match.
Bob
im usin a dell dimension 1100,pentium 4 2.8 ghz with 512mb ram,in my manual it say that my PCI slots connector data widht (maximum) are
32 bits but im gonna buy a nvidia GeForce FX200 PCI graphic card which is 64 bits, and im confuse whether i could purchase it???what actually does these 32 or 64 bits means??

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