A ani cez ten thunderbolt to neni iste ze to pojde s 60Hz, ptz ten displayport tam je na tych macoch osekany na niektorych modeloch na single linku (potom to ide len 30Hz)
https://support.apple.com/en-us/HT204154
takze si najprv musis zistit ze ci mas ten "Some models"All Thunderbolt 2 models support 4K displays at 30Hz in Single Stream Transport mode. Some models support 4K displays at 60 Hz in Multi Stream Transport mode.
Na popise toho mac 2015 je ze "model with AMD Radeon R9 M370X only" podporuje az do 5K na 60Hz. Mas AMD radeon?