Can you tell me which computer I need to upgrade to if my current Mac Pro is running out of memory? I’m not sure about all of the options for the 16” if I need them?
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First you want to see what size the hard drive you have now is. go to the black apple in the top right corner and choose “about this Mac”. Then select storage. That will tell you 256, 512, 1TB. Whatever that is, sounds like you need the larger.

The 16” MacBook Pro is the flagship Mac these days so it’s easy to spend more than you really need to. If you really like the 16” size (some people find it a little too large) then you will have a few choices to make: processor, amount of ram, graphics card. But the only major choice you really need to make is hard drive size. So check out the entry level 16” but just increase the hard drive size to the size you think will fit you for the next 5 years or more. The 16” can go to a crazy amount. You won’t need 4 TB and 4TB would cost a crazy amount so don’t feel like you need the largest you can buy. But I’m guessing a 1 or 2TB will be plenty for you.