I have a 2014 iMac with a 2TB SSD but ordered a 2017 when they were announced. I just came to my senses and cancelled that order because its obvious Apple will redesign the iMac in summer 2018 making the iMac Pro internals (aside from the CPU options of course) the standard.
What I'm trying to say is this 2017 iMac is a holdover for a better redesign next year with more ports, better ventilation, better speakers, HDR screens, etc.
Definitely worth waiting another year for that.
There is no way you will have a redesigned iMac in your hands by summer 2018. At the earliest it will be fall/winter of 2018 and I'm not even sure if that will happen. Trust me you will be waiting for a while either way. I am in the same boat as you with a 2014 iMac and I have been considering pulling the trigger on a 2017 model but I will probably wait it out which mostly likely means close to 2019 before anything different.
Depending on the benchmarks/thermal performance/sales I could end up getting a 2017 model though but I doubt it.
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The cooling mechanism for one. No point cramming in high end graphics cards inside if they are just going to throttle due to overheating.
I would bet the house for the following;
- iMac Pro will be out for a long time without any refresh.
- The next iMac will be even slimmer thus challenging the engineering limits even more. Probably trying to come up with something that's going to make headlines like the MicroSoft Surface Studio did though to what extent is the $64,000 question
Apple will really make a point to differentiate the iMac and iMac Pro in the next few years both internally and visually.
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