My bad. The NVS 510 does have a fan, albeit a small one. I think I was confused by seeing pictures of other NVS cards which are truly fanless. Unfortunately I think all of those are discontinued.

I have been driving two UP2414Qs using a Nvidia NVS 510 card. This has four DisplayPort outputs, but when using MST to drive the UP2414Q monitor at 60Hz, it counts as two outputs - so in fact the card can only drive two of the monitors at a time. Nonetheless, it works well, as long as you pick the c...