the alpha version of kxrpc running on the alpha server is right.

You will want to have the intel version of kix32.exe in the netlogon folder so then when your logon script is executed on the Intel clients, they are running the correct version.

If you are going to be executing kix scripts on the alpha server locally, then you will want to use the alpha version of kix32.exe, place kix32.exe in the %systemroot%\system32 folder.