Tried CAC-1070 on a “DD RADEON R7 260X 2GB D5 DP HDMI 2XDVI” card hoping to make 4k 60hz work. However, the max resolution allowed in Windows 10 is 1080p at 60hz although I get 4k at 30hz without the adapter in both HDMI 2.0 and HDMI 1.x 

The 4k TV is RCA 65 inch (Model: PRK65A65RQ)

Please help.

Thanks.