I'm surprised here fellas. Listen, I love the 5,1 Mac Pro. It's the best computer I've ever owned. The fact that it's able to stick with the punches since 2009-10 (the 5,1) and to this day being able to rip through games and good frame-rates at 1440p resolutions using 60-100hz monitors is a testament to this truth. It still serves well as a "prosumer" or "enthusiast" machine.
But in no way, shape or form, can a first gen i7 keep up with encoding, rendering, major photo work, or 4k movie editing if your business relies on it. It is foolish to buy a Mac Pro 5,1 at this point for doing real, "time is money" work, that supports you and your family.
I'm surprised that someone did this last year, but it's worth to check it out. This is how our Xeons (basically the same exact thing as an i7 990x....that is if you have the best Xeon you can get for your Mac Pro) compares against an i9 9900:
www.phoronix.com
Don't fool yourself. I love 5,1s. It still gets MY 1080p video editing done (hobby) and allows for fast 1440p gaming on a 60Hz monitor. But what if I switched over to 2.5-4k video editing and charged for it? What if I wanted to push 144Hz in games, or move up to 4k in games? What if I had to render something professionally and the time difference was 2 hours vs 1 hour with modern hardware? Ehrm, no.
No one should be buying these to do
real work in 2019. Looking at 5,1 prices, they really have not came down. They are not a "steal." To get a loaded 5,1, with a GOOD CPU, lots of ram, and the best CPUs (x5690) you are still looking at around $1,000 if not more. How long do you trust the PSU to keep running, all the fans?
To me, this really feels a lot like the late G4 MDD days when the G5 came out. Boy I held on to my G4 MDD. Overclocked it to 1.5GHz, loaded up the HDDs, added a SATA card. Upgraded the GPU to a 7800 GS OC and had the bios flashed and got a couple years out of it. I feel like I'm at that point with the G4 MDD with my Mac Pro 5,1. Can I get a couple years out of it? Yep! Should I buy one right now for $1,000+ and hope to get 4 years out of it and call that a smart decision? Nope, and that's regardless of real work or not.
Regarding Windows 10--I notice the auto-updates a lot on my work PC because IT has it enabled to shut down every so often. On my 5,1 Mac Pro, I do NOT have the same issue because I rarely ever shut it down. In-fact, I don't even really remember it happening much at all on my Mac. Sleep works very well, unlike what many are reporting with the latest MacOS. Nothing pisses me off more than sleep not working properly. And you get a feeling that Windows really supports your Mac, whereas in MacOS you feel like you are hanging by a thread at this point. You will NEED a boot-screen capable GPU whenever things go wrong--are you OK with having a 5770 or whatever on hand? I've had to use it a few times over the past couple years.
"Catalina" does not OFFICIALLY support the Mac Pro 5,1.
Again, I'm mostly an enthusiast so I'm fine with minor toying with things. But if I was getting real work done and making money...I would leave this machine behind quickly.