Think long and hard before buying it!
There are two versions of this system the Intergraded Graphics models (IG) and the Discreet Graphics (DG)
The cheaper IG models don’t have the more powerful GPU logic which you’ll want.
As far as RAM its soldered! So what you buy is all you’ll get 16GB!
The SSD drive is upgradable! But the interface is custom to Apple! The Ultimate Guide to Apple’s Proprietary SSDs While you can get an adapter which allows one to use M.2 standard blade SSD’s. Not all M.2 SSD’s or adapters play nice! And you can encounter issues with your Mac not responding properly to and from sleep or hibernation states.
I have a DG model which I love and was a good investment at the time. Even still keep in mind Apple is about to drop a brand new series of systems using their own CPU’s (APU). If you can I would wait a bit.
Parts for the 2015 models are becoming hard to find as many people loved the system so much they just won’t give them up and Apple doesn’t offer spare parts for this series either. So getting it fixed will be harder than a newer system.
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