My guess would be video encoding/decoding and rendering.

Some Intel and AMD CPU come with an iGPU that you can use to transcode videos even some Xeons, there's no need to add a GPU just for that

	▲	einsteinx2 3 days ago \| parent [-]
		A lot of them don’t though. My Xeon doesn’t, so I threw a cheap used Nvidia Tesla P40 in there to do the job. Also it can handle a lot more simultaneous streams than any iGPU I’m aware of.