The MSI Katana 15 does indeed have a USB-C port with DisplayPort out as noted in the I/O section: 1x Type-C (USB3.2 Gen1 / DP) With a USB-C-->DisplayPort adapter, it should work perfectly fine with the HP X34 at 3440x1440 165Hz. But my honest recommendation is to get another ultra-wide with HDMI 2.1 functionality.
6 days ago · If you’re looking to use the features of HDMI 2.1, for example, you need a monitor with an HDMI 2.1 port and a video card with an HDMI 2.1 port—if one of them is running HDMI 2.0, you won’t
HDMI 2.1 vs HDMI 2.0. Put simply, different HDMI cables can transmit different values. These values are the video and audio quality which are transferred from the HDMI cable to the screen.I see that I never directly answered your HDMI 2.0 eARC port question, only indirectly. If you connect all your video sources directly to your TV using HDMI 2.1, you will get all the HDMI 2.1 features. While eARC is a new protocol released with HDMI 2.1, it's simply a new protocol that reuses the ethernet wires added to HDMI cables in HDMI 1.4.
2tC5.