The question
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The answer
Not particularly.
Most nMP will ship with low power entry level cards.
What the low end of the MP 2013 GPU configuration is somewhat open to question. It is extremely likely not a W9000 equivalent specs that Apple has talked about. It also seems doubtful that it will be W5000 equivalents since those couldn't drive 7 displays (according to AMD ). So seems likely will start off around W7000 class. AMD labels that as mid range in the FirePro line up. If you want to spin those as "low power entry cards" you can but it is bit premature to throw that classification at the configs.
Aren't going to age much better than anything else.
It isn't so much how they age but rather where they start off ( how much "headroom" do users have at the start) and how long the device is in service all in combination with user workload.
A laptop with a single GPU is going to run out of headroom (expecially in a GPGPU context ) alot faster if there is just one GPU in the system than a two GPU system. They simply not in the same class in terms of "aging" impact.
The other far more relevant issue is that the number of limited Macbook's is order of magnitude higher than these new Mac Pro's ever will be. To create a market for the solutions there needs to be a sizable number of folks to sell to. The laptop users will be moving from "fast enough" to "fast enough". These 10-25% drop offs from peak performance aren't particularly necessary.
The set of users who are primarily buying either a PCI-e GPU card or CPU package(s) wrapped in box the new Mac Pro design isn't going to be a fit. Those who do more balanced system upgrades every 3-6 years the "external GPU" isn't going to be a factor new GPU typically due about the same time as new CPU.
There will need to be a solution or the iCans will lose value very quickly.
If you buy a Mac Pro with the primary intent to sell it later ( and not to generate money now) then you are primarily missing the point of buying one IMHO. And frankly even used Mac Pro often don't get sold with bleeding edge video cards in them. Typically users strip parts that could be used in an updated Mac Pro ( or equivalent ) and sell the Mac Pro with the "old stuff" that was put aside... or just stripped.
Folks who buy used are looking for "good enough" performance. It isn't maximum available performance. If they wanted max they'd be buying new. If the aged Mac Pro 2013 is substantially faster than what they are currently sitting on then the future Mac Pro won't particularly use loose value much more than a current design Mac Pro would.
"Now with last year's hottest GPU" isn't a good marketing slogan.
And Apple was going to use this one ? They are also highly unlikely to use the "Now with the most bleeding edge spec porn available this month" . That isn't a particularly good marketing slogan either.
Current MP still has GPUs from 2010, if they don't update faster than that they will be an even bigger laughingstock once they are an integral proprietary part of machine.
In what way does the Mac Pro 2013 represent a continuation of the 2008-2010 Mac Pro strategy? Sure if Apple continued with their 2010-2012 strategy with the new Mac Pro it would be a failure .... but why would they commit to an abandon/transition strategy for their post transition product?
Frankly, the base Xeon E5 updates are going to be slower than mainstream CPU package updates. Likewise if Apple sticks to the FirePro/Quadro class custom GPU cards this to will be slower than the mainstream GPU card updates. So Mac Pro's probably aren't going to iterate as fast a MacBook's or iMacs. or minis. That has relatively little to do with whether PCIe slots are included or not.
Apple gets custom GPU boards out on time for MBP and now for the iMac on a regular basis. It is puzzling why that would be a problem for the Mac Pro going forward as long as there is a sufficient customer interest to support assigning the R&D resources to moving the product forward over time.
And not everyone is in love with or using OpenCl.
Not everyone is in love with CUDA either. It far from being a critical factor of whether the Mac Pro 2013 will be successful or not.