Gateway performance 2000 mid tower

I have been researching my memory for my computer and I know it is a pc800 but I need to know which one goes into my model computer the pc800-45 or the pc800-40. What is the difference? I want to order A.S.A.P

The correct memory for your computer is our PC800-45 RDRAM .
This memory is guaranteed to be compatible and can be returned for any reason if it is not.

Please let me know if you have any other questions!
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