The 2014 Mac mini has been an incredibly poor value since, well, 2014, just ask anyone who has owned a Late 2012 Mac mini whether they would like to trade up, and chances are you will get a resounding NO from 99 out of 100 owners. The only thing the 2014 model has that the Late 2012 does not is a Thunderbolt 2 port. Everything else is just not all that compelling.
The Iris Graphics 5100 was a half decent draw but obviously well out of date and, crucially, incapable of driving a 4k display at 60Hz (never mind to a standard that Apple would be happy with.
My main criticism from the 2014 was the official shutting down of DIY upgrades to HD and RAM. Losing the quad core option was a deal breaker for many more but explained away later by the divergence in sockets leading Apple to make a difficult decision in terms of budgeting.
The goalposts have moved an awful lot now and Apple will already know where they stand with the pricing of the 2019 Mac Pro (no way is it going to cost as little as $3000 and the generously specified iMac Pro shows us a big hint for what Apple could do to increase the average selling price - don't offer it with poverty spec in the first place).
I think when the 2019 Mac Pro drops it won't be matching the 2013 Mac Pro for price points simply because it'll come generously specified even if the RAM is replaceable which will raise the starting price well beyond the 2013 Mac Pro.
This will inevitably leave a nice gap in the $2-3000 price range for a top end Mini to present a buying option.
Apple went with discrete GPUs in the 2016" MacBook Pro because Intel really has no other customers for the Iris iGPU other than Apple and someone at Apple did the math. Price will ALWAYS win out over better technology with PC OEMs. Intel believes that its GT2 graphics are good enough for the vast majority of PC buyers today and began de-emphasizing work on GT3 and GT3e GPUs a while ago in favor of trying to compete with AMD and NVIDIA in the discrete GPU market (Arctic Sound).
If you step back from the enhanced onboard graphics, there's a real sense that Apple will stick with CPU+dGPU - especially if a case redesign is coming for Mac Pro and the Mini with higher predicted heat from the Coffee Lake PCs due to extra cores. I don't think they'd need the Kaby Lake G CPUs because of they only have 2 cores.
Apple saw the writing on the wall and probably negotiated a price with AMD for the Radeon Pro GPUs at close to the same cost as the price differece between the Core i7-6700HQ (HD 530) and the Core i7-6770HQ (Iris Pro 580), which is $55 USD. I strongly suspect that AMD was willing to sell them the GPU for close to that price as the technology really is not that cutting edge, but it suited Apple's needs and gave both price tiers of the MacBook Pro a discrete GPU, which becomes a USP in their world. It also handed AMD another customer win for their portfolio.
You'll have no argument from me that AMD offered Apple really good deals to get their GPUs into Macs. Apple wouldn't want to be stuck with bespoke tech that could be ended if it's unpopular.
Yes, the original 4K iMac had Iris Pro 6200 graphics, which did not go over very well when it was introduced. It was also a very inadequate solution for driving that particular 4K panel. Believe it or not, I do not think Apple will make that mistake again. Many would argue that the Radeon 555 is not all that much better than the Iris Pro 6200, but it is quite a bit more capable than the Iris Pro 6200 and the Iris Pro 580 (by a smaller margin) and way more capable than any Intel GT2 or GT3 part.
Again, I think Apple couldn't see much of a roadmap into the future for Iris Pro. Intel have better iGPU coming down the line after the recruitment of
Raja Koduri. They've been influencing Intel to get better quality iGPU into their products with the 13" MacBook Pros the main case in point. They'll have had to accept that iGPU with 15" MacBook Pro isn't popular after the lack of interest in the Iris Pro series for that size of laptop. The advent of 4k screens means that iGPU efforts will probably be limited to the 13" MacBook Pros.
Others on this forum has theorized that Apple may opt to use the Core i5-8305G and the Core i7-8706G with Radeon Pro WX Vega M GL graphics, but it will require a rethink on the chassis or an entirely new chassis to deal with the 65w TDP of those CPUs. It is possible, but it is a long shot for the current chassis.
A Mac Mini Pro model - as hinted in some places - could replace the lower price points of the Mac Pro 2013 (effectively allowing that to go on clearance months before the 2019 model arrives) but could come well enough specified to be usable off the shelf like the iMac Pro. If you're redesigning the case to allow a higher TDP you can then look towards something that could fit the marketing - for example:
Xeon E-2126G - $255 with 80w TDP - 6 cores (no hyper threading) and UHD P630 graphics for Quicksync - effectively a close cousin of the i5-8600 only faster base speed at the expense of a higher TDP to cool. The Xeon chipset and motherboard allows the possibility of more Thunderbolt ports - if Apple get the right mix of value for money, horsepower and heat/silence they could have a good quality headless replacement for the 2013 Mac Pro at the lower price point.
Add a decent GPU to that (up to an AMD 580X on a PCIe card) and design the case to cool the combination and you have something that could fill the lower end of the Mac Pro 2013 price range which Apple could do if they know at this stage that the Mac Pro 2019 will start at $4-5k next year.
And that's just one theory. There's so many variations of what could happen for the Mini that, as we've all said, within 4 weeks we may know what we're looking at - even if nothing - in terms of the Mini going forward.
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I'd say - Chop off that unnecessary 4k monitor that will be taking up space in a landfill at some point, drop the price accordingly, and we have a great starting point.
I think there has to be a viable headless option given that
server farms were mentioned in the recent Bloomberg article on the Mini. If this headless option comes with an iGPU SKU (as well as a dGPU SKU) it has to interest most of us just from being 4 years newer tech than the currently available Mini.