No such thing as Thunderbolt card.  Unless board has thunderbolt controller on the motherboard with thunderbolt header its not EVER happening.

Intel gave up on proprietary thunderbolt so new systems call it USB 4.

Thank you. I knew they did, but didn't know about 4. Thanks again.

Thanks speedstep, not sure why that article should be there then. Dell sell there own PCIe Thunderbolt cards. I shall investigate USB4

@Ted Loukes , don't be surprise if you find flat Earthers in here.  Dell actually sells Thunderbolt PCIe card for your system.  Dell even has Thunderbolt 4 card priced cheaper than Thunderbolt 3.

Thanks for the replies, both were helpful. 

@Ted Loukes  Did you have any luck with either of those cards in your 7050? 
Contemplating using one of these with a KVM dock. 

Thanks!