|Are you sure you haven't got the other computer configured to hibernate. That does shut down the PSU, after first saving the contents of memory to the hard disk. When it resumes it does a POST then recovers the memory from the hard disk carrying on from where it left off.|
Once power is removed you lose the contents of memory, there is no getting around that unless the power supply itself goes into a power saving mode supplying just enough power to keep the memory alive which doesn't require fans to be running.
Only the more expensive power supplies will have this facility so I would check with the other computers to see exactly what is happening. Possibly this power supply does not have a power saving mode.