Hi, after playing around in the past I also got to following conclusion: 1. Grafics Card Driver: In the Catalylist Control Center (CCC) under "My digital Displays->Display Colors" EDID (Extended Display Identification Data) should be turned OFF (!) My experience: I Set it to 6500 K in CCC as I also wanted to calibrate for 6500 K in agryllcms. Alternative: Do not install catalyst Control center if you do not need it. Why I use Catalyst control center? -> to underclock (!) my grafics card. This makes the fan noise very silent. 2. Monitor: Turn on a wide gamut mode in Dell u2711 (directly in the Monitor OSD-Menu): possible selections for the wide gamut modes: Standard, Adobe RGB and custom (Advantage (?) in custom mode: you can manually tune RGB directly on the monitor). 3. On Win 7 64 Bit use the Patch from Graeme Gill This three steps delivered pleasing wide gamut resuls on my system (Dell 2711, Colormunki Display, Radeon HD 6800, Win 7 64 Bit) Thanks again Alex PS: I write the whole setup as maybe someone else is having the same problems....