You might find this article useful. It's from 2013, so the info isn't super-current, but there's still some good info...
https://www.pugetsystems.com/labs/articles/4K-Monitor-Requirements-and-Usage-492/
I thought this was an important point...
Quote:
Finally, if you are not gaming plan on needing at least 1.5GB of video memory for each 4k display you will be running unless your system is solely used for light tasks such as showing pictures or playing movies. In that case, 1GB of video memory per display should be more than sufficient. If you are gaming, the amount of video memory you need per display is going to depend heavily on the game but will almost certainly be at least 2GB. To be safe we recommend having at least 4GB of video memory per display, but if you play games like Skyrim with lots of mods you may find that you need as much as 6GB of video memory.
I don't know how much video memory HLSL uses, but it probably wouldn't hurt to look for a car with 2GB of video memory at a minimum.
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