I think it's supperted by the Open Source Driver, but not Nvidia's own driver. So if you're looking for 3D gaming. It's a no. The GT 730 card support was dropped with the 390 driver.
I have an ancient PC, just dont want to upgrade yet. Just looking for a ultra cheap GPU to drive a 4k monitor. If I have have to spend any more on GPU, then I might as well upgrade the entire PC
I currently use a 730 GT with Z-16 and It does require a propriety driver if comes with a fan. The fan screams with the open source driver. Some 730 cards can use a driver newer than the 390 depending on build/brand.
Storm is correct. Nvidia did drop support for the GT series cards, but like Storm said, the 390 driver should drive it. Also, the Nvidia 390 driver should support 4K. So as long as the driver is able to well, drive the card ok, there is no need for an open source driver.
As far as looking at info regarding your GPU and controlling fan speeds, there is a linux app called Green With Envy. Also, you can get info and adjust a few important things regarding your GPU using the Nvidia X Server Settings app.
So there are indeed options still available to older Nvidia card owners. I can't remember if the GT 730 had support for only 2 monitors, or if it could support 3 or 4, I am sure Storm knows.
GT 730 cards with a Fermi chip on the GPU Can only use the 390 driver. There are versions of the card without this chip.Fan speed control is not supported on the EVGA card I use.