American Megatrends MegaDual User Manual page 42

Note: The driver that you load must support this
setting. If it does not, the result will be the same
as Disabled.
>4 Gbyte The settings are Enabled or Disabled.
Addressing
Fast Command Set this to Enabled to maximize bus transfer
Posting performance.The settings are Enabled or
Disabled. The default is Enabled.
Cont'd
36 MegaDual PCI Motherboard User's Guide