Graphics Card for Music Master PC

I run dual monitors and have noticed that displaying text is breaking up and some of the images are fuzzy. So it is time for a new Graphics Card, I guess.

Problem: my monitors are HDMI but most new Graphics cards are Display Port

Current system

https://support.hp.com/us-en/product/hp-envy-700-200-desktop-pc-series/5399651/model/6753463/document/c04102691

AMD Radeon R9 270, 2GB, 150W max

LeBonCoin.fr

 Tried to put up an advert for the rental of 6A at the weekend. Kept throwing me out. Waiting for their customer services to come back to me