Do you even peruse this forum at all? If so, you would know this already. If, not--a quick google search of "How to Upgrade CPU on 2013 Mac Pro" will give you some results.
Go in to an Apple store, and ask the genius if the CPU is a "user serviceable part", same as the RAM is a "user serviceable part".
Guess what, it's not. The fact that you can get to it and disassemble it and DIY, doesn't mean it's what Apple classifies as "user serviceable". A technician can pull and replace the 2013's GPUs as well, going to claim they're "user serviceable"?
Just like the cMP's bluetooth and wifi aren't "user serviceable", while the drive sleds, ram and PCI cards, are.
User Serviceable, are the parts Apple designs specifically to be replaced
by the end user, not an Apple Certified Technician.
I meant as a consumer. Are you saying that if there was this hypothetical 2017 Mac Pro, and therefore, by co-existing with another Pro model, the iMac Pro, that it would split the consumer base? If, so, how? And, why would I care?
You wouldn't care, Apple would care. Splitting the userbase only makes sense when the separate products produce a market enlargement sufficient to cover the increased expenses of two different machines. A sealed appliance Mac Pro is not going to appeal to any significant market outside of markets already addressed by the iMac Pro, while stealing sales, and therefore component volume discounts from the iMac Pro.
So, you're saying that they want to sell the iMac Pro's more than this hypthetical 2017 Mac Pro, if it existed, because the iMac Pro has screens that share with other Mac lineups. So, economically and logistically, Apple would prefer to move the iMac Pro's with those screens?
Because... because by moving those products, they can pass the savings from the extra orders they would make for moving them so well to the regular iMacs?
The more screens Apple sells, the cheaper the screens are, and the better either their margins, or their ability to lower prices - that means they can make the iMac Pro cheaper than it would otherwise have to be, or the iMac, depending on where they want to push around their pricing.
As long as Apple keeps the 27" 5K iMacs then I don't think LG would refuse $$$! Apple also seems to have invested in the 5120-by-2880 resolution. So, monitors like the 27" LG UltraFine monitor for headless Macs are available. The existence of another Pro mac, like this hypothetical 2017 Mac Pro that we have been discussing would not threaten 27" 5K LCD screen production by any means.
So long as Apple buys enough of them that LG wouldn't be better off using the production capacity to build something else that sells in greater volume, and is therefore more profitable.
Lots of reports are the ultrafine is pretty much no longer stocked - it's an order-ony product. Given how badly it was received, quality issues etc, and being TB3 (so basically Mac)-only, I'll go out on a limb and say the entire product was probably a rush job, created to soak up overproduction on panels, not as a serious attempt to set up an independent LG 5k display line.
It's not enough for 5K panels to be profitable for LG to make them, it has to be more profitable to make them, than it would be to make something else, and 5k is basically an orphan resolution that only Apple are invested in, and even then, the only reason they've invested in it, literally the only reason, is because they couldn't get a proper resolution independent vector-based UI to work out. 5K / retina is a kludge, pure and simple.
And, even if Apple makes an 8K iMac in 2019 or whathaveyou, you would have to figure that it would have to be some kind of BTO since the tech is so new and cost prohibitive.
8k is a mainstream video format, and 8k displays are going to be mainstream displays in a few years, similar to the transition from 1080p to 4K. 5K is its own little wilderness, existing only by the chance of fate that it's double the 1440p resolution of a non-retina 27" display.
I don't really know how long the iMac Pro was in the brewing or drawing stages. It doesn't seem like it was in incubation for that long though since the only thing that has change between the regular iMac and iMac Pro is the color and the extra cooling solution for the beefier CPU and GPU components.
IIRC the iMac Pro has more in common with the 2013 Mac Pro, than the normal iMac in terms of its hardware system design. I guarantee you, the way it was announced was not the way it was intended to be. If there had not been the fever pitch in the mac community about Apple abandoning the pro space, if you hadn't had Gruber, Ritchie etc openly saying "something has gone wrong in Apple" about the 2013, there would have been no mea culpa meeting, the iMac Pro would have just launched as "The new (i)Mac Pro", and that would have been Apple's sole pro desktop.