Asus ROG MAXIMUS XII APEX Manual page 28

7. M.2 slot
The M.2 slot allows you to M.2 SSD modules.
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The M.2 SSD module is purchased separately.
1-12
M.2_1 slot supportS PCIe 3.0 x4 mode Key M design and type 2242 / 2260/ 2280
storage devices.
M.2_1 shares bandwidth with PCIe x4 slot, when M.2_1 is populated with a x2
device, PCIe x4 slot will run at x1 mode, when M.2_1 is populated with a x4 device,
PCIe x4 slot will be disabled
Intel Optane Technology is supported by M.2_1 when sourced from the PCH.
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Before using Intel Optane memory modules, ensure that you have updated your
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motherboard drivers and BIOS to the latest version from ASUS support website.
M.2 slot supports IRST (Intel Rapid Storage Technology).
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Chapter 1: Product Introduction