SAS 9.4 requires at least 2-4 GB of RAM just to launch the Enhanced Editor. In contrast, SAS 9.1.3 runs smoothly on 512MB of RAM. For users with older laptops or virtual machines, the portable version is a godsend.
If you need to run legacy SAS 9.1.3 64-bit code: sas 91 3 portable 64 bit