> I wonder if that university still uses their PS3 based supercomputer cluster
Almost certainly not. A typical lifetime of a supercomputer is around 5 years, give or take. After that the electricity they consume makes it not worth continuing to run them vs. buying a new one.
AFAIK both Titan and Jaguar received significant mid-life upgrades. So in such a scenario 7 years sounds reasonable.
(At a previous job, we had a cluster that was about 15 years old. Of course, it had been expanded and upgraded over the years, so I'm not sure anything was left of the original. Maybe some racks and power cables.. :) )
Almost certainly not. A typical lifetime of a supercomputer is around 5 years, give or take. After that the electricity they consume makes it not worth continuing to run them vs. buying a new one.
See e.g. the Cell-based Roadrunner, in use 2008-2013: https://en.wikipedia.org/wiki/Roadrunner_(supercomputer)