The card's Nvidia. Mint comes with the Nouveau driver which doesn't quite cut it, at least not for me. Maybe some of that's baked into the kernel these days, I'm not sure.
Earlier Mints (LMDE included) provided an installable package of the OEM legacy driver for cards as old as mine, but Debian 12 (which LMDE 6 is based on) doesn't.
I should point out that graphics works without the OEM driver, but it doesn't work well. Work is offloaded to the CPU that the card is perfectly capable of doing.