HBA: how to install

All,
 
We've got an Alphaserver 800 5/500 running T64 5.1A pk4.  I believe that
the last time I built the kernel (2/2004) I chose to include all the
options.  Now we want to add an HBA to the machine.  We're in receipt of
part number DS-KGPSA-Cx (or is -CA?) and want to install it.  No
instructions came with this whatsoever.  How do I find out if I need to
do anything after I've physically put it into the machine?  How do I
find out if we have the drivers installed already or if we need to
download them?
 
Any help/suggestions is appreciated!
 
Thanks!
Andy