From the latest DSPP newsletter:

"Aries is the PA-emulator that allows PA machine code to execute on an
Itanium Processor Family (IPF) based system and the following short
article discusses some of the issues surrounding it's use in running
ISV's PA-based applications without need to re-build the application
under IPF.

Aries offers levels of performance to make it a viable compatibility
solution. Aries' performance varies depending on the nature of
applications. For user-interactive/system-intensive applications, Aries
performance is reasonably comparable to the native PA-RISC run of the
applications (using systems of roughly comparable power). For compute-
intensive applications, Aries performs at a very reasonable level:
integer applications slow down by a factor of 2-4 and floating-point
applications slow down by a factor of 3-6."

Would this be a viable consideration for MPE/iX on the IA-64 platform?