EVGA X299 Micro ATX 2 Installation Manual page 21

EVGA X299 Micro ATX 2 (121-SX-E296)
Card Slots
The X299 MICRO ATX 2 features two x16 PCIe slots, one x4 PCIe slot, one
Socket 3 Key-M M.2 80mm (backwards compatible with Key-M 60mm, and 42mm),
and one vertical Socket 1 Key-E M.2, which contains the Intel WiFi / BT module.
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