no error only an essential part is missing! and sorry that my question wasn't clear enough!
basically: with my NMP in Bootcamp-Win8.1, my "AMD FirePro D700" graphic cards are not recogniced as supported hardware by the "AMD FirePro Control Center" to arrange the 3 screen's with Eyefinity.
here a comparison of the Catalyst setup window from my old Mac Pro (left) with a "Radeon HD 5800 Series" and at the right the new Mac Pro 2013 with 2x "AMD FirePro D700" (sorry for the bad image quality).
note the "AMD Eyefinity Display Group" option is missing with the FirePro D700!
under the "Desktop Management" tab is stated: "..., or create AMD Eyefinity display groups on supported hardware."
which basically means that the new Mac Pro with the FirePro D700 is not recognized as supported hardware?!
my question: does anybody know a workaround to get the Eyefinity-Option enabled with the NMP running Windows 8.1 under Bootcamp?
Note: all 3 screens were pluged with an active Mini-Display adapter to a diffrent Bus. and it worked flawless for many years with my old Mac Pro!
strange observation: checking the information-properties in the AMD Control Center under Windows 8.1, the hardware is soemtimes listed as a "AMD Radeon HD 7900 Series" and sometimes as "AMD FirePro D700 (GireGL V)" ... very peculiar isn't it!!?!