At the moment, only AMD Radeon RX 6000 series cards support it. NVIDIA will start enabling it on its RTX 30 series in the coming months, this will require you to update the BIOS of the video card.
There is a new BIOS update for the EVGA X299 lineup, adding Resizable BAR support! The EVGA Z590, Z490, and X299 motherboards support this feature. To learn more about Resizable BAR and what it does, check the link below!https://t.co/pYDXjvDnlJ pic.twitter.com/DieU1dxqC1— EVGA (@TEAMEVGA) January 25, 2021