Apple Thunderbolt Display

If I were to pick up a thunderbolt display, My assumption is that I could connect it via my video card's Mini Displayport output and lose Thunderbolt hub functionality. What about if I were to set up a Thunderbolt add-on card? Would connecting it to that negate having a video card? Or would my gpu still process my video and just output it through the Thunderbolt card? Thanks.

i9-9900K

Gigabyte Z390 AORUS PRO WIFI ATX

Corsair Vengeance LPX 32 GB

Sapphire Radeon RX 580 8 GB PULSE

Corsair RMx (2018) 850 W 80+ Gold

submitted by /u/johnangelo716
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