HP Probook 640 G1 Upgrade RAM, SSD, Hard Drive (Disassembly & Replacement) - YouTube
HP ProBook 640 G1 Business Laptop, Intel Core i7-4th Generation CPU, 8GB RAM, 500GB HDD, 14 inch Display, Windows 10 Pro, Refurbished Laptop
Amazon.com: HP Probook 640 G1 14in Laptop, Intel Core i5-4300M 2.6GHz, 8GB Ram, 1TB Hard Drive, DVDRW, Webcam, Windows 10 Pro 64bit (Renewed) : Electronics
HP ProBook 640 G1 14" INTEL CORE i7-4610m 3 GHz 8GB RAM NO HD NO CADDIE | eBay
Refurbished: HP Grade A Probook 640 G1 14.0" Laptop Intel Core i5 4th Gen 4200M (2.50 GHz) 8 GB DDR3L 360 GB SSD WIFI Windows 10 Home 64-bit (Multi-language) - Newegg.com
Amazon.com: HP ProBook 640 G1 14in HD Anti-Glare Notebook Laptop, Intel Core I5-4200M Up to 3.1GHz, 8GB RAM, 500GB HDD, Windows 10 Professional (Renewed) : Electronics
HP ProBook 640 G1 Laptop- 240GB SSD, 8GB RAM, Intel i7-4610M CPU, Wind – Buffalo Computer Parts
QuickSpecs HP ProBook 640 G1 Notebook PC HP ProBook 650 G1 Notebook PC