10-Bit display test with 16-bit TIFF

Okay, I just got this new HP Dreamcolor Z27x and want to test it on 10-Bit with Windows 8.1 64bit and Photoshop CC 2014.
I followed that guide:
10 Bit Color Depth and Adobe Photoshop CS6 | ted lansing photography blog
to create the TIFF-File:
In Adobe Photoshop create new file
900 px wide and 300 px tall
RGB color and 16 bit
Use gradient tool to create gray scale gradient from RGB: 64/64/64 to RGB: 96/96/96
Safe file as 16 bit tif file
Wich behaves very strange!
When I create the gradiant in 16bit mode, it shows me zebra stripes, like it would be 8-bit.
I actually need to change the Color Mode from 16 to 8 bit, to see a smooth transition within the gradiant.
BUT, did I just kill the 16-Bit information with changing the mode or is it just a bug? I´m really distracted...
Please can somebody tell me, what to do?
Thanks in advance!
PS: In Premiere, the TIFF-File is shown naturally in 10-bit like it should be!

What video card are you using? Can you try using CS6? There are issues in Photoshop CC with 10-bit and AMD cards, with Adobe and AMD both blaming each other but neither seems in a hurry to resolve. See Re: PS cc and 30 bit

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