The newer 800 Series by Intel includes the i840, i820 and i810 chipsets. 
These chipsets support the new RAMBUS system RAM, ATA-66 and PCI Hub features.
The PCI Hub is a new and quite different PCI Bus Controller implementation,
based on the PCI 2.2 specification. 

The Montego A3DXstream will NOT function properly in motherboards that use 
this newer Bus architecture as well as in motherboards based on the AMD Athlon
processor. In these cases, an upgrade to the newer Montego II or Santa Cruz is 
recommended.
  
___________________________________________________________________________