SAS/ETS 12.3 is essentially
a maintenance release of SAS/ETS software that runs on SAS 9.4.
In addition, the procedures
that make up the SAS High-Performance Econometrics product are available
with SAS/ETS for use in single-machine mode. Depending on data characteristics
and model complexity, you might see performance improvements over
comparable SAS/ETS functionality that is not multithreaded.