Von: ftp://public.dhe.ibm.com/as400/produ.../Downloads.txt

Code:
1) Download the service pack file for your PC's processor type.
   
   FTP DIRECTORY    FILE NAME          PROCESSOR TYPE
   -------------    ---------------    --------------   
   image32          SIxxxxx_32.EXE     32-bit (xxxxx is the service pack id)
   image64a         SIxxxxx_64A.EXE    AMD 64-bit, Intel 64-bit Xeon
Also _64a ist auch für Intel CPUs.