Question about Samsung ViewFinity S9 - S95UC S49C950UAU

We bought this curved monitor. All good so far. Now we want to connect it to a Z-Tower. However, this only has DisplayPort connections. We have now ordered Display Port to HDMI cable adapters from you. https://www.digitec.ch/de/s1/product/garbot-displayport-hdmi-020-m-hdmi-displayport-video-kabel-36937973 Unfortunately, the screen is now flickering. So it doesn't work. Can you recommend an adapter that fits the resolution of the monitor?