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Join Date: Aug 2010
Location: Fort Rucker, AL
You are not getting a 4K signal doing this, you are getting a 2560x1440 signal.
With your LG remote, go to "all settings" -> "Channels" -> highlight "Channel Tuning" and on the remote continuously press 1. A new "Host Diagnostics" window will pop up. Under HDMI, it will not show 3840x2160 at 120 Hz. That is the actual signal that you want. By making a custom resolution timing of 2560x1440 with a resolution of 3840x2160, all you are doing is artificially making a DSR like 4K signal fitting into a 1440p signal to the TV. Won't look nearly as clear as real 4K.
GPU: TITAN RTX - 2175 MHz, liquid cooled
CPU: 9900K 5.4 GHz, liquid cooled
MB: ASUS Maximus XI Gene
RAM: G.Skill 32GB 4000 MHz Samsung B-Die
SSD: Intel Optane 905P - 960GB
DISPLAY: LG 48CX OLED / VR: Modified Vive Pro