Live backup PC

I operate a business that mostly depends on design by simulation relying on constant operation at very high CPU utilization of big multi-core PC's. And because of the high utilization, I seem to kill them on a fairly routine basis, 3 Dell 7820 Xeon Gold's in the last two years, which is worse than average, I probably kill one on average every 2nd year. We can talk about what's dying separately, it doesn't matter here, the issue at hand is DOWN TIME.