is a good one.
Choose the small FFTs to stress cpu, or blend for cpu+ram. If your hardware is tight it should run no problem, but a bad stick of ram or anythng wrong really, will cause orthos to halt and give you an error message.
Warning though, this will stress your cpu to near max, so if you don't have good cooling, heat may be a concern.
is a good temp monitor. Always good to keep an eye on it. If you see temps going over 60c while stressing, I would suggest stopping orthos.