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Dell has the exclusive from AMD till 2018 to offer a complete threadripper with Alienware line,...no idea how pricey they will be,...July 25 win info on various stuff will be made by AMD...

And from GURU3D :

ASUS, Gigabyte, MSI and ASRock to Reveal X399 motherboards July 25th

The ASUS Flagship is rumored to go for $349 .

That from the wccftech website.

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That is the ASUS Flagship Motherboard.

Link to Wccftech:

ASUS’s ROG Zenith Extreme Flagship X399 Motherboard For AMD Ryzen Threadripper Processors Unboxed – More X399 Details At AMD’s Meet The Experts Webinar on 25th July