matUnable to set 4k120Hz via Cable Matters DP->HDMI 2.1 converter
truthfultemporarilyWhat adapter are you using specifically, because on their website I can only find 4k30.
I bought this one: www.amazon.de/-/en/gp/product/B094XR43M5
Cable Matters HDMI Displayport Cable 1.4 with 4K 120Hz or 8K 60Hz - 1.8 m, Unidirectional DisplayPort to HDMI Cable in Black, Support for RTX 3080/3090, RX 6800/6900 UVM: Amazon.de: Computer & Accessories
Cable Matters HDMI Displayport Cable 1.4 with 4K 120Hz or 8K 60Hz - 1.8 m, Unidirectional DisplayPort to HDMI Cable in Black, Support for RTX 3080/3090, RX 6800/6900 UVM: Amazon.de: Computer & Accessories