HP Thunderbolt 3 PCIe 2-Port I/O Card on Z840 - HP Support Community - 8298816
HP Thunderbolt 3 PCIe 2-Port I/O Card 3UU05AA B&H Photo Video
L33676-001-HIGH P HP DUAL PORT TBT3 ADD IN CARD - THUNDERBOLT 3 AIC PCI-E X4 ( 2 ) TWO DISPLAYPORTS DP ( 2 ) TWO USB TYPE C ( KIT PN: 3UU05AA / 3UU05AT )