I believe Mac Pro are built to last. It's not like those cheap PC motherboards (that I also have in office and home, especially the X58 that I'll be modding soon too). If u get a chance to open up one of these baby, you'll immediately see how sturdy it is and how well the soldering was done. Due to the air cooling and ventilation of the whole case, I don't think it can be fried so easily as there are no overclocking options available.

Currently, my mac pro 12 core is performing nearly identical to a Ryzen 1800x / Threadripper 1900x. The performance is also somewhere between top of the range Mac Pro 2013 and entry level iMac Pro 2017. More importantly, it has no thermal throttling like the latest Macbook Pro 2018 with i9.

Under FCP X BruceX benchmark, the Mac Pro 4,1 12 core completed the benchmark in under 20 seconds. While the entry level iMac Pro completed in 16 seconds. If you compare for the price performance I guess the Mac I've built is much more worth it in terms of cost.

iMac Pro = 20% faster in FCP renderings but the Mac Pro 12 Core only cost 38% of the iMac Pro cost (RM19,000).
I've bought 3 Powermac G5 and 4 Powermac G4 and 1 Powermac G3 for my next projects. Haha.... All of these still can power up and I've even optimised it to be able to watch youtube smoothly. Way smoother than my early intel mac.

Just built a recording/ music production room with my newly acquired Powermac G5 with Logic Pro 9 (bought for RM250 in ebay). The performance is very satisfying.

End of the day, all I wanted to say old macs are awesome!!