WIN10 does not utilize full 16GB of RAM, 8GB hardware reserved - Microsoft Community
Test System Memory for Errors in Windows 10, 8 or 7
Windows 10 64-bit pro reserves 8GB of RAM for hardware out of 16GB - Microsoft Community
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Windows 10 Help Forums
Dell Optiplex Windows 10 Pro Desktop Computer Intel Core i5 3.1GHz Processor 8GB RAM 500GB HD Wifi with a 19" LCD Monitor Keyboard and Mouse - Refurbished PC with a 1 Year Warranty (DCi58GB500GBW10Pro19)
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8gb ram installed only 3.44 gb ram usable - Microsoft Community
HP 15.6" FHD, Intel Core i7-1165G7, 8GB RAM, 512GB SSD, Silver, Windows 10, 15-dy2172wm - Walmart.com