Welcome to the forum Zerothis.
Try the program AIDA32, do a google search for it. Run the program and it should tell you the exact model of mainboard your Aptiva has.
Does the board look like this one? The maximum CPU for that board is a AMD K6 PR300.V58XA Motherboard
I did a google search for V58XA, and it came up with an ACER motherboard, that could be the model...just use AIDA to double check.
Hope that helps you out.
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