MSI's X99A MPower board sports the new USB 3.1 but not the new plugs if you were hoping for USB ports that do not have an orientation.  Depending on the CPU installed, he four PCIe 16x slots can support up to three GPUs at once if you use the M.2 port, otherwise four cards can be run.  The Realtek ALC1150 7.1 codec is compatible with S/PDIF and provides optical out as well as 5 mini-jacks for speakers.  [H]ard|OCP preferred manually overclocking to the use of the OC Genie or the Command Center software and two of the reviewers experience some quirky behaviour which prevented the board from winning an award but once the settings were tweaked the board performed admirably.

"MSI’s X99A MPower promises to deliver a ton of features at a reasonable price. SATA Express, full speed M.2 support, and USB 3.1 compatibility are all examples of what this motherboard has to offer. The MSI MPower series has never disappointed us before, so we have high hopes for this motherboard."

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