10Bit monitor colors - how can I be sure it really works?

My monitor and my graphics card supposedly support 10Bit per color channel.
I also set the option in the preferences dialogue (I think it's called 30Bit there).
That should give me 1024 instead of 256 color intensities per channel. So I made 2 dark green gradients each in 8Bit and 16Bit documents. But the number of bands (which you can clearly see in darker green) didn't seem to be any different from each other.
Also applying a "Posterize to 255 colors" effect on a dark-green gradient inside a 16Bit document didn't introduce much of a change (except a general shift of bands, because when posterizing to 255 colors, you take 1 away from 256)
Or is my hardware not compatible? I thought that PS would complain if I set color-depth to 30Bit although my hardware can't support it.
This is my "system info":
[code]
Adobe Photoshop Version: 13.0 (13.0 20120305.m.415 2012/03/05:21:00:00) x64
Operating System: Windows 7 64-bit
Version: 6.1 Service Pack 1
System architecture: Intel CPU Family:6, Model:10, Stepping:7 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2, HyperThreading
Physical processor count: 4
Logical processor count: 8
Processor speed: 2394 MHz
Built-in memory: 32725 MB
Free memory: 23641 MB
Memory available to Photoshop: 29734 MB
Memory used by Photoshop: 60 %
Image tile size: 128K
Image cache levels: 4
OpenGL Drawing: Enabled.
OpenGL Drawing Mode: Normal
OpenGL Allow Normal Mode: True.
OpenGL Allow Advanced Mode: True.
OpenGL Allow Old GPUs: Not Detected.
Video Card Vendor: NVIDIA Corporation
Video Card Renderer: Quadro 2000M/PCI/SSE2
Display: 1
Display Bounds:= top: 0, left: 0, bottom: 1080, right: 1920
Video Card Number: 1
Video Card: NVIDIA Quadro 2000M
OpenCL Unavailable
Driver Version: 8.17.12.7605
Driver Date: 20110909000000.000000-000
Video Card Driver: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Video Mode: 1920 x 1080 x 4294967296 Farben
Video Card Caption: NVIDIA Quadro 2000M
Video Card Memory: 2048 MB
Video Rect Texture Size: 16384
Serial number: Tryout Version
Application folder: C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\
Temporary file path: C:\Users\NINOSC~1\AppData\Local\Temp\
Photoshop scratch has async I/O enabled
Scratch volume(s):
D:\, 698,6G, 417,5G free
Required Plug-ins folder: C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\Required\
Primary Plug-ins folder: C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\Plug-ins\
Additional Plug-ins folder: not set
Installed components:
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   AdobeLinguistic.dll   Adobe Linguisitc Library   6.0.0
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   ExtendScript.dll   ExtendScript 2011/12/14-15:08:46   66.490082   66.490082
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   hydra_filters.dll   AIF   3.0   62.490293
   icucnv40.dll   International Components for Unicode 2011/11/15-16:30:22    Build gtlib_3.0.16615
   icudt40.dll   International Components for Unicode 2011/11/15-16:30:22    Build gtlib_3.0.16615
   image_compiler.dll   AIF   3.0   62.490293
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   JP2KLib.dll   JP2KLib 2011/12/12-16:12:37   66.236923   66.236923
   libifcoremd.dll   Intel(r) Visual Fortran Compiler   10.0 (Update A)
   libmmd.dll   Intel(r) C Compiler, Intel(r) C++ Compiler, Intel(r) Fortran Compiler   10.0
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   pdfsettings.dll   Adobe PDFSettings   1.04
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Required plug-ins:
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   Adaptive Wide Angle 13.0
   ADM 3.11x01
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   Average 13.0 (13.0 20120305.m.415 2012/03/05:21:00:00)
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   BMP 13.0
   Camera Raw 7.0
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   Cineon 13.0 (13.0 20120305.m.415 2012/03/05:21:00:00)
   Clouds 13.0 (13.0 20120305.m.415 2012/03/05:21:00:00)
   Collada 13.0 (13.0 20120305.m.415 2012/03/05:21:00:00)
   Color Halftone 13.0
   Colored Pencil 13.0
   CompuServe GIF 13.0
   Conté Crayon 13.0
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   Crop and Straighten Photos 13.0 (13.0 20120305.m.415 2012/03/05:21:00:00)
   Crop and Straighten Photos Filter 13.0
   Crosshatch 13.0
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Optional and third party plug-ins: NONE
Plug-ins that failed to load: NONE
Flash:
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Installed TWAIN devices: NONE[/code]

I think I got it working now. I also started PremierColor that came with this notebook (you can select many color profiles like sRGB, adobeRGB, and many more) - the only annoying thing is this "Split View" icon that often get mis-placed at the title bar and can not be turned off.
Now I can really see the difference between a "posterized to 255 levels" and a real 10-Bit gradient.
The funny thing is, when I move the window or some UI element is over the area (like a tool tip, marquee, etc.), the area switches to 8-Bit.
Unfortunately, I can't post a picture of this.
Maybe when I tried that before, there was constantly something that forced the display back in 8-Bit mode.
Yay.

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Thanks!

I have the same problem. The Sync ipod option in the menue is grayed out, and so not available. HELP!

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