I am on 9.6SP1 and used msu30x64w8.inf. This worked for me and was able to get an IP Address. Make sure your PXE Rep is updated or redeploy your PXE Rep to grab those imported drivers.
I am actually stuck on different spot. Anyone know what steve.may is referring to with "You'll also need to download all of the SP3 drivers from Microsoft and import those into your driver database"? Do you have a location for these drivers and do you mean the "HII Driver Management" database?