https://pcpartpicker.com/list/fYZChq
This! All of this...
I'm the exact kind of current Mac Pro pro-user Apple is going to lose on my next upgrade cycle - and I can assure you, there are plenty more like me. In fact, a lot of pro users have already defected.
I already have an NEC MultiSync display, so there's no for an AIO system (iMac), which would be wasting money - nearly $1,000 for the 5K display - which if I wanted to spend, I could spend on component performance upgrades.
Also, I'm one of the users where I don't need super-expensive super-strong GPU, but want a strong CPU with more than 4 cores - something the iMac doesn't offer, and the current Mac Pro is behind the 8-ball - especially in the price to performance ratio. There are also little features that both lack, such as internal PCIe slots and more than one drive bay - whether they're NVMe M.2 slots on the Mobo, or multiple SataIII SSD and 3.5" drive bays in the case. HUGE! missteps there. HUGE!
The new iMac Pro is even worse. While it has more cores (8, 10, 18), memory, and (allegedly) a great GPU (Vega), it starts at $5,000 - and again I don't need a display. Nor do I need a Xeon processor with ECC memory - that's entirely overkill for my needs. The 8 cores is desirable, but not when it comes with a needless display and a starting price of $5,000.
Like Wally said, you can build your own system with equal or exceeding specs for significantly less.
One little beastie I've compiled has the 7820X - which performs nearly identically to the 7700K for single core tasks, straight out of the box. The multicore performance is also outstanding - and that's not even overclocked.
It has the 8GB Radeon RX 580, the same GPU in the new 2017 5K iMac - which would be perfect for my needs with Capture One Pro. Capture One Pro utilizes multiple cores, and the AMD GPU has the current OpenCL architecture - which C1P also utilizes very well. There's also 32GB of RAM, and NVMe M.2 boot drive, and 500GB SSD active jobs drive.
So this build I've sourced is the best of both worlds, and perfect for my specific needs. ...all for $2,225 (the 7820X is currently overpriced at $680, the MSRP is $600, and you can get it for $600 at Newegg).
https://pcpartpicker.com/list/fYZChq
If i want to drop another $300, I could go for the 6-core 7800X, or drop nearly $600 by getting the Ryzen 1600X and a less expensive X370 motherboard. ...which I've priced out at $1,700. Best of all, there are so many options in between $1,690 and $2,225. ...and if I want to bump the build up to $2,500, it gets even better.
This is the problem with Apple. You can't pair a GPU to your liking with a CPU to your liking. Apple pretty much says, "Nope". If you want a stronger GPU, you need the stronger CPU.
I could almost live with a 21" iMac if it offered the 4.2GHz i7, 512GB flash drive, and the 8GB RX 580, and allowed for user-upgradeable memory....for $2,300. In fact, even though I want a 6 or 8 core machine, I'd probably buy it and not bat an eye, as I currently use a much slower quad core.
But the idiots at Apple are just stubbornly stupid. They're not going to give anyone that option - as they know, very few would buy the 5K 4.2GHz for $2700 with the option above.
As for the current black Mac Pro: it's an outdated, internally expansionless, 4 year old buggy POS. Why would I spend $3,000 a 4 year old 6-core machine, with 16GB of ram and GPUs that totally flakes out? Even the $2,500 6-core refurb/clearance Mac Pro is wildly over priced for what you get - and it still flakes out. And hell, those GPUs were outdated in 2013, and 4 years after it's release, very few APPs can take advantage of dual GPUs. You're seriously better off with the 8GB Radeon RX 580 than dual FirePro D700s. ...Again, you don't get that option.
That's the part that has me entirely frustrated with Apple. They piss on us with their pricing and lack of options, and expect us to roll over because....they're Apple.
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1) I don't need a display.
2) One of the apps I use a LOT can utilize more than 4 cores efficiently.
3) I'd like more than one internal drive bay, and preferably a fast flash drive
I agree - most Apple Pro users will stick with the iMac. For some it will be overkill, for others, it'll be just right. And for some others, if they need more than 4 cores, they'll just live with the 4-core performance deficiency, as they won't want to spend the $2,000-$3,000 premium for the 8-core iMac Pro. And I don't blame them.