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The Cascade Lake Xeon , which Apple is currently using , is absolutely the last processor family that can be installed in the MP7,1 . And it appears only W Xeons are fully compatible . The MP 2019 will never be compatible with Ice Lake or Tiger Lake Xeons , as they utilized a different socket type .
Upgrading within a small ecosystem that has no possibility of expanding requires some good cost/benefit thinking. I decided upon a robust mid-tier system that can carry the office workflow years into the future - also thinking that I don't really want to pull out components that I paid a lot for and replace them with 'somewhat' better components - thus losing $$ on the initial purchase. Is it really worth buy the base model and then every year adding 32 Gb more RAM and upgrading to the next level CPU and keep doing that every two years?
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What many people do is buy a Mac with AppleCare so that it's under warranty for three years then sell it when there is still a month of warranty left & the price is still high then buy a new Mac with AppleCare etc etc Companies usually do the same with leasing & swapping out equipment every three years.
If the computers I buy for my company can still effectively get the job done, I don't replace them. Once they have paid themselves off - the rest of the time is pure profit off their workload. That needs to keep going as long as possible and up to the point that the machine still works but can't keep up with expanding demands of workflows. I then sell them very cheaply. I'm not a miser. That's the system I use.
 
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Upgrading within a small ecosystem that has no possibility of expanding requires some good cost/benefit thinking. I decided upon a robust mid-tier system that can carry the office workflow years into the future - also thinking that I don't really want to pull out components that I paid a lot for and replace them with 'somewhat' better components - thus losing $$ on the initial purchase. Is it really worth buy the base model and then every year adding 32 Gb more RAM and upgrading to the next level CPU and keep doing that every two years?
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If the computers I buy for my company can still effectively get the job done, I don't replace them. Once they have paid themselves off - the rest of the time is pure profit off their workload. That needs to keep going as long as possible and up to the point that the machine still works but can't keep up with expanding demands of workflows. I then sell them very cheaply. I'm not a miser. That's the system I use.

It seems as if the release of the MP7,1 is very similar to the MP3,1 . The best chips for the MP3,1 was 8 Core at 3.2 GHz ( 2 x X5482 ) . And it was shipped by Apple . It could not be upgraded any better . The best chip , in terms of core count and turbos , for the MP7,1 is the 28 Core at 2.5 GHz base , 4.4 GHz turbo ( W-3275M ) . That won't change and Apple is already shipping this processor choice .

But if we can get other Cascade Lake Xeons to be truly compatible with the MP7,1 , with future firmware updates or hacks , the real excitement will come with the memory configuration support .

If someday we're able to install a Xeon Platinum 8280L ( 28 Cores at 2.7 GHz base , 4.0 GHz turbo , but most importantly with 4.5 TB of official memory support ) in the MP7,1 , it will be a pleasant miracle . And here , folks , may be the real possibly of decent future upgrades with this Mac model . Even 10 years from now I'm pretty certain that'll be a ton of memory to have installed in a personal workstation .
 
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