Alight, I read this thread, and finally got a solution out of it, so I figure for the rest of the admins who have to deal with this sort of thing on gx745, and whatever is next (gx800, gx820, etc)...
What I did:
On your ghost console server, navigate to:
(Start, Run... )
C:\Documents and Settings\All Users\Application Data\Symantec\Ghost\Template\
In that folder you will find "Broadcom 57xx"
Copy that folder, and rename it to "Broadcom 57xx (gx745)"
(this step is really not needed, but will keep from messing up other labs or computer sets using that template... just a safe guard).
Now, go to this link:
http://www.broadcom.com/support/ethernet_nic/netxtreme_desktop.phpDownload the "DOS NDIS2" drivers for the Broadcom NetXtreme
What I have found is that each iteration of optiplex's gets a new updated nic, and hence, and new driver (at least as far as DOS NDIS2 goes.)
Extract the download to your desktop (or elsewhere) and get the "B57.dos" file can overwrite the one in your new "Broadcom 57xx (gx745)" folder.
DO NOT overwrite the protocol.ini file.
Now, go into Ghost console (which you may want to close/open after the previous steps to reload the templates)...
Then right click on your gx745 client and go to properties... It should now have a reccomended template of "Broadcom 57xx (gx745)" ... If not, go select it yourself and try to pull the image.
If it finds the nic and boots into ghost... Problem solved.
I image the rest of the new gx series will need this driver update... hopefully broadcom will keep supplying us with the NDIS2 drivers.
Good luck!