Hi Ray
To begin please review the following link which outlines the differences in support on X32 and X64
Should I run XP32 or XP64.
https://www.blackmagic-design.com/support/detail.asp?techID=160
Originally X64 drivers were released for usage by Decklink Software developers who needed to run this platform. Depending on your workflow you may find that X32 offers more functionality and support.
Hardware.
Decklink HD Extreme requires a 4x PCIe connection both phyisically and electrically.
This is the minimum requirement.
.
The intel boards listed at do not have PCI-X controllers
https://www.blackmagic-design.com/support/detail.asp?techID=160
This limits the Disk array controllers available for your HD system.
If you have anymore questions let me know.
Regards
Andrew McLeod
pcsupport@blackmagic-design.com