The US Department of Defense went quite a bit further. They created the Condor Cluster in 2010 which was comprised of 1760 PS3s. At the time it was placed 33rd worldwide for a supercomputer.
https://phys.org/news/2010-12-air-playstation-3s-supercomput...
they couldn't have gone for 1776 of them?
at some point it was claimed that the reason sony removed the ability to run linux was because, literally, Saddam Hussein (maybe not) was using them to pilot jets or somesuch.
At the time, entire PS3s were cheaper than what it cost to get the CPU from IBM.