I recently stumbled across some Craigslist "treasure" and had been looking for a single node, all-in-one compute host to begin my wannabe homelab adventures... discovered a gorgeous older Cisco C240-M3 and had to have it. It came with three (3) nVidia Quadro 2000, but i'm not able to pass-through the GPUs using ESXi 6.5 (free version) as the checkbox option appears to be greyed out. However, i am able to properly pass-through the HDMI audio. Initially thought it was me (and my lack of VMware experience) that was the problem, but i've recently come to suspect it may be an unsupported card in version 6.5 -- honestly, due to limited experience i have no idea if i should be testing older versions of ESXi or giving myself three extra PCIe expansion slots for something more useful.