There are two slots.
You can see your notebook's current configuration by either using CPU-z or the Windows command line
Open a cmd line dialogue window -> type in wmic memorychip get banklabel,capacity and press the enter key.
To open a command line window --> type cmd in search box and then press the enter key.
You will need to order two 8GB memory modules.
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For laptops or desktop PCs, use the Fn+Esc keystroke while logged into Windows to locate the Product number (SKU)