dang. that is a bummer. i picked up a MacPro5,1 from a govdeals auction and it is a pretty nice computer. it even runs dark mode in OSX Mojave. guess it's days are numbered =(
i do have to say though, the single core performance of my MacPro5,1 is pretty abysmal. even with similar clock speeds, my 2015 mac mini is 50% faster in single core performance.
Intel(R) Xeon(R) CPU E5620 @ 2.40GHz
quad core, dual cpu. so 8 cores total.
multi-core performance is great!
we use it as a Unity build box and it functions great since we're normally doing multiple builds at a time, and image compression & shader compilation are multi-threaded. but it's definitely slower if you are just doing 1 build at a time.
sucks that in 2 years when Apple starts requiring the latest Xcode for iOS build submissions we will have to retire this guy =(
As an upgrade thought, that box should be able to handle dual X5675's, which are fairly cheap on Ebay.
There's a very noticeable performance improvement from (eg) the E5645's, let alone the E5620's.
Saying that as I used to use a self build box (Supermicro motherboard) with dual E5645's as my desktop, but it always "felt" a bit slow. :/
Had the opportunity to upgrade to X5675's, and now it "feels" fine interactively due to the higher base and boost clock.
The highest model, X5690's, from all reports are literally no faster in use than the X5675's (maybe thermal throttling?). So not worth the extra spend. ;)
i do have to say though, the single core performance of my MacPro5,1 is pretty abysmal. even with similar clock speeds, my 2015 mac mini is 50% faster in single core performance.