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HP ProBook 640 G1 Memory(RAM) Upgrade in 1 Minute - YouTube
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HP ProBook 640 G1 14" i5-4200M 2.5GHz 8GB 128SSD DVD Win10 Pro No Webcam Grade B | eBay
HP ProBook 640 G1 Business Laptop, Intel Core i5-4th Generation CPU, 8GB DDR3 RAM, 256GB SSD Hard, 14 inch Display, Windows 10 Pro (Refurbished)
HP ProBook 640 G2 - i5-6300U · Intel HD Graphics 520 · 14.0”, Full HD (1920 x 1080), TN · 500GB HDD, 7200 rpm · 4GB DDR4 · Windows OS | LaptopMedia.com