yeah, I just talked to an Apple specialist in Austin, TX. They said they're working on, for example, a Beck tune with over 100 plug-ins and it barely even registers or taxes the processor on the iMacPro. Which is about, from what he said, 75% of the power of the Mac Pro.
The iMac Pro's 8 core is probably within 10-15% of the Mac Pro's 8 core. There are some security fixes, some instructions added that don't matter at all in DAW, and some clock speed differences ( about 9% ), but there isn't a substantive change in implementation there. The next step at the iMac Pro is 10 cores whereas the Mac Pro steps to 12. That is a bigger gap on core count.
Definitely gonna want to upgrade the Boot drive as Logic X Pro with add ons is about 140 GB. There really is no need to upgrade the processor, he said, it will handle everything short of really high end music sound production just fine.
The other option is to get another boot drive. If possibly going to get 2-3 apps with bulky 140+ GB footprints then Apple's $/GB is prohibitive. Apple is probably going to charge in the $400/TB range. If you are going to have lots of bulk data just sitting around that is pretty high.
He said the best solution for storing audio data is Thunderbolt.
Long term storage (mostly archiving ) ? USB 3.1 would work fine. If the storing is being done to a single HDD then Thunderbolt is overkill. Even low end two drive RAID HDDs is pretty tame for Thunderbolt.
If the is only an 8 core CPU that isn't putting out maximum heat, there will also be options to put a SATA device inside the Mac Pro. ( I don't think Apple is going to sell that pre-configured from the factory, but it will be an option).
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I’d recommend you sit on the sidelines for 4-6 weeks until after first availability. Wait for reviews and benchmarks. Base MP7,1 system might not actually be enough for your needs. Especially would look at RAM and SSD capacity.
I'd wait a couple of weeks to see of there was firmware , T2 , etc low level issues with potential cards and/or external components working with .
RAM isn't really an issue to wait on. If not using more than 32GB now then probably need much just after transition to Mac Pro. if need more there will be multiple 3rd party vendors can get that from. It isn't a sealed case (iMac Pro ) adding more later isn't rocket science.
SSD capacity. Again, adding a second internal SSD to the new Mac Pro has multiple options. Every single Application doesn't have to the in the boot volumes /Applications/ path. [ for MacStore stuff that is a useful default as that is where it likes to stuff updates, but otherwise it should be all that necessary. ]