Can the MCX311A-XCAT support Windows 8 Embedded 64 bit OS?

Infrastructure & Networking Software And Drivers WinOF Driver
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Can the MCX311A-XCAT support Windows 8 Embedded 64 bit OS?

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Yes, if I recall Windows 8 kernel is similar to Windows 2008/ 2008r2. The Mellanox driver for Windows supports this.