Asus ESC4000A-E10 - Page 76

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Chapter 4: Motherboard Information
8. M.2 (NGFF) card slot (NGFF1)
This slot allows you to install M.2 devices.
This connector supports type 2242 / 2260 / 2280 / 22110 devices on PCIe interface.
The M.2 (NGFF) device is purchased separately