4K monitor resolution wrong

after putting some money aside, I finally made the move to invest in a 4K Display by EIZO.
starting up Boot Camp, the resolution was 800x600ish although in the display settings it showed 3840x2160?!
lowering the settings resulted in even smaller resolutions and in the Catalyst settings, the same issue occurred.
although there I found out that 30HZ was the max setting but should run at 60HZ.
I tried to connect through the TB and HDMI with the same result
anybody an idea what I am doing wrong (with a BIG thanks in advance!)?
my setup:
EIZO Flexscan EV3237 4K monitor using a "clicktronic" DisplayPort to MiniDisplayPort adapter cable.
nMP (late 2013 - MacPro6,1 - AMD FirePro D700)
OS X 10.9.5 (13F34) - Boot Camp running Windows 8.1

THX Dave for willing to help me out!
should have have posted here that I found the solution and it was due to be not a win specialist!
was all a matter of correctly dialing in all display/resolution/zooming settings!

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