I don't know about dp to hdmi, but gtx 970 and up supports hdmi 2.0. Get this one a premium hdmi cable which does 18gbit/s. And you can do 4k 60 hz 4:4:4 chroma hdr at 8 bit.
Intel Core i7 8700K | 32 GB DDR 4 PC 3200 | ROG STRIX Z370-F Gaming | RTX 3090 FE| Crappy Monitor| HTC Vive Pro :3