Is that by any chance a ATI RAGE or X1000/2000 Series GPU card?
What is the exact Make & Model of the GPU card that uses the M64-P GPU chip?
Looking at AMD Download page under "Legacy Graphics" for "RAGE SERIES" there are no drivers for Windows 8 or newer. Only Windows XP or older.
Personally why are you trying to use such an antique GPU card? For research or was it given to you as a gift?