Gateway 700S Memory Upgrade

I'm trying to upgrade the memory in my Gateway 700S desktop. The memory currently in the machine is 512MB RDRAM PC800. I don't know if I need PC800-40 or PC800-45? Could you please help me determine the correct memory for my machine. Thank you.

All of our  PC800-40 RDRAM is the correct memory for your computer (700S).
This memory is guaranteed to be compatible with your computer and can be returned for any reason.
Please let me know if you have any other questions!
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