CMS 16GB (2X8GB) DDR4 19200 2400MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Asus/Asmobile® RS Server RS100-E10-PI2, RS300-E10-PS4, RS300-E10-RS4 - C112 at Amazon.com
8GB DDR4 RAM Memory Upgrade for ASUS RS Server RS300-E9-PS4 (PARTS-QUICK) - Walmart.com
Just how repairable is the PS4? - Polygon
OFFTEK 16GB Replacement Memory RAM Upgrade for Asus TS500-E8-PS4 (DDR4-19200 - Reg) Server Memory/Workstation Memory at Amazon.com
PlayStation 4 Pro Teardown - iFixit
Could Microsoft upgrade the Xbox One's hardware to fix the PS4 performance gap? - ExtremeTech
128GB (4X32GB) DDR4 DIMM Memory Ram Compatible with ASUS/ASmobile Motherboard TS500-E8-PS4/V2 Server (Z10PA-D8) Server Load Reduced by CMS D82 - Computer Memory Solutions
64GB (2X32GB) Memory RAM Compatible with ASUS/ASmobile RS500 E8 Series Server, E8-PS4 Server (Z10PR-D16), E8-PS4 V2 Server (Z10PR-D16) Load Reduced ECC only by CMS D17 - Computer Memory Solutions
PlayStation 4 Pro Teardown - iFixit
PS4 Pro's additional RAM frees up memory for game developers - Polygon