Macbook pro (retina, 15-inch, Mid 2015)
AMD Radeon R9 M370X 2048MB
OS El Capitan 10.11.6

Mac -> mini DPport out -> cac-1170 -> HDMI 2.0 cable(18Gps,max scale 4096×2160,330AWG OD6.0MM) -> Monitor HDMI port (http://www.ebay.com/itm/New-40-Dzonei-KSP401-Real-4K-UHD-TV-HDMI-60Hz-3840×2160-LED-TV-Monitor-/152136716693)

did SIP disable. did download SwitchResX.
did every suggestion here but not working.
please help me to get 60hz.