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Find out what the laptop's CPU is and look up its graphics specs.
E.g. I have a Lenovo with an Intel i5-6200U, which includes Intel HD Graphics 520, which can do 4k @24Hz over HDMI, or @60 Hz over DP.
I don't think you'll have any issue with the desktop's GTX 970, but again, look up the spec for the exact card you have, ports vary between manufacturers.
chez_jay
What do you need to drive a 4k screen like this
https://www.amazon.co.uk/dp/B07CTHWKQC/ref=twister_B07SDR3Z2W
Would just plugging a bog standard laptop with onboard graphics (whatever the onboard with 8th gen intel is) via HDMI do it? I've seen stuff about that only working at 30Hz or would it be USB-C or just not able to drive it?
Similar with a decent but dated graphics card (Nvidia GTX 970), would that do it?
I've done a bit of googling but can't seem to find much definitive info.