To everyone:
AMD cards dither the output by default, but you can disable it:
http://www.monitortests.com/forum/Th...d=3314#pid3314
Quote:
Check the Catalyst Control Center under "Information" -> "Software" to get the 2D driver path. Then run regedit.exe and open that path in the left pane. You should see values in the right pane like "AdapterDesc" and a bunch of settings. Add a DWORD value named TMDS_DisableDither (for DVI) or DP_DisableDither (for DisplayPort) with a value of 1
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HDMI_DisableDither for HDMI. Reboot after.
Only that can explain why I see a difference between 8 and 10 bit output on my 6-bit DELL U2212HM connected with DVI