How much RAM does the HP ProBook 640 G1 support and what type of memory does it use?
The computer supports up to 16,384 MB (16 GB) of system RAM across two customer-accessible memory module slots. It uses DDR3L 1600-MHz PC3-12800 dual channel memory in configurations ranging from 2,048 MB up to 16,384 MB. (Page 12)
From the official HP Probook 640 G1 Notebook PC manual, page 12
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