So, even if it's unlikely that it was a virus, is it still a security hole? I feel that "security through obscurity" or just trusting that everyone that plays FC is trustworthy is dangerous. I do doubt a virus caused the hardware failures, but it raises the question of how safe LUA is.
Regarding power supply: the power supply was a mid range psu, rated at 700W, more than the computer would ever pull, and since the CPU and GPU never pulled that much when running FC, I'm sure the PSU was well below 700W (CPU 125W, GPU max 400W, but if W usage is linear, only 60% of 400W, 240W). Noise in the PSU could have been an issue, but was never an issue with any other game, most of which maxxed out GPU and/or CPU.
Regarding performance, I have everything maxxed graphics wise, and I get lows 50 fps and usually above 65 fps on quick missions.
Just deduction. If you have a counterexample, please share. Sure, like Slayer said, it could have been a PSU issue, but why would FC, a piece of software that doesn't even max gpu or cpu, tax the PSU the hardest? Usually when benchmarking a system, the harder you push it, the more likely it is to fail.
Both of these computers that failed while running FC could run many other types of games just fine. FC never even maxxed out the phenom x4 nor it's GPU.