MacBook Pro 17" Unibody RAM Replacement - iFixit Repair Guide
Logic Board For Mid 2015 Apple MacBook Pro i7 16Gb Ram A1398
Apple MacBook Pro Retina 15-Inch "Core i7" 2.4GHz A1398 ME664LL/A 2013 – Coretek Computers
Restored Apple A1398 MC975LL/A 15.4" MacBook Pro, Mac OS X 10.11 El Capitan, Intel Core i7-3615QM Processor, 16GB RAM, 256GB Solid State Drive (Refurbished) - Walmart.com
Bought this Old late 2013 16gb a1398 15inch MacBook Pro. Had Yosemite OS installed and only 32 battery cycles. Hardly used it seems. I know people more excited about the new 2020