...but apart from that, part of my point was that the result is meaningless without gathering any information about what people want it for - or even what you mean by "fastest". A Mac Pro with an afterburner is likely to be faster at dealing with ProRes video than the "fastest PC" but as much use as an inflatable dartboard if you need CUDA. The Mac Pro isn't great for gaming but then the "fastest PCs" may be optimised for server loads, extreme multi-threading, CUDA etc. and might not be wonderful for gaming, either. The higher up the performance range you go the more important the question "faster at what?" becomes. (See: is the Studio Ultra faster than the Mac Pro...!)