MacPro 3,1 with GTX 970 and Bootcamp issues

Hi,

Im having an issue with my MacPro 3,1 in Bootcamp when using a MacVidCards flashed GTX 970 card. Ive emailed MacVidCards separately, but I thought I would try here in case someone has a similar setup and has managed to resolve the issue.

Configuration
MacPro 3,1
Video Card: NVidia GTX970 flashed at MacVidCards
OS: 10.12.3

Issue
When trying to boot Windows 10 in Bootcamp, all I get is a black screen.

Investigation so far
1) Ive been able to install OSX 10.12.3 with the GTX970...

MacPro 3,1 with GTX 970 and Bootcamp issues