Your card is fully supported by the NVIDIA driver under Mandrake 9.0.
The difference between the IA32, IA64, and AMD64 is the architecture they're targeted for. IA32 refers to Pentium (I - IV), AMD Athlon, etc. IA64 refers to Intel's Itanium and Itanium II processors. AMD64 refers to AMD's Hammer chips. You'll want the IA32 driver.
If you're unsure of which files to download, please use NVchooser.sh from the driver download page.