4K monitor with iMac Late 2012 Hackintosh.

Is there a way to make 4K monitor (Samsung 28" LU28R550UQEXXT) to work at 3480x2160 resolution as a native res? In the display setting if i choose default for display, everything as menubar text become too small. but if i select scaled option it's so laggy for me. Thanks.
My Specs.
CPU Intel Core i7 3770
MB Gigabyte GA-Z77p-D3
GPU AMD Redeon RX580 4GB
Ram 16GB DDR3 1600
SSD 240GB
Display Samsung 28" LU28R550UQEXXT connected via HDMI

submitted by /u/imtor_krit2008
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