Find out from your CAD software Support what GPU card they recommend. Generally, Professional GPU cards are best for CAD type software. But depends on your CAD software requirements.
Most CAD software has recommended GPU Cards to use with their software.
You can try the Vega GPU Cards or the high end RX-5xx GPU cards. Both are more powerful and faster than the HD-7xxx GPU cards that are almost if not already considered to be legacy.
Found this website that shows the best Workstation Graphic cards for 2019: Best Workstation Graphics Cards for Professional Work in 2019
Depends on your budget and computer hardware (Motherboard and PSU) where you are going to use the new GPU card.