A-Tech 8GB Module for HP ProBook 450 G5 Laptop & Notebook Compatible DDR4 2666Mhz Memory Ram (ATMS322447A25978X1) at Amazon.com
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OFFTEK 16GB Replacement Memory RAM Upgrade for HP-Compaq ProBook 450 G5 (DDR4-19200) Laptop Memory at Amazon.com
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HP ProBook 450 G10 Business Laptop, 15.6" FHD Display, Intel Core i5-1335U, 16GB RAM, 1TB PCIe SSD, Webcam, Backlit Keyboard, Wi-Fi 6, Windows 11 Pro, Silver : Electronics - Amazon.com
parts-quick 32GB (2 X 16GB) Kit Memory for HP ProBook 450 G3 (DDR4) 2133MHz SODIMM RAM at Amazon.com
Amazon.com: HP ProBook 450 G7 Business Laptop, 15.6'' Full HD Display, Intel Core i7-10510U Quad-Core Processor, 32GB RAM, 512GB SSD + 1TB HDD, HDMI, Backlit Keyboard, USB Type-C, Windows 11 Pro :
Amazon.com: HP ProBook 450 G9 15.6" FHD Business Laptop, 12th Gen Intel 10-Core i7-1255U, 32GB DDR4 RAM, 1TB PCIe SSD, WiFi 6, Bluetooth 5.2, Backlit Keyboard, Windows 10 Pro, BROAG Extension Cable : Electronics