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T480 is a great machine. You can find them on eBay for $200-$300 quite easily. They work great with Linux and are still old enough that they are decently repairable.
I've also heard that the older X1 carbons are really solid if you want something a little sleeker.
The nVidia GPUs on the Tx80 line suck. They throttle much too early and too aggressively bringing them down so much they can't even handle Quake 3. And because they're on the same heatpipe as the CPU that can happen very quickly.
I have never been able to properly use the GPU in my T580 although it should be able to at least handle Tomb Raider 2013 or Doom 2016.
CPUs are also somewhat choked. I had to use throttled to make mine run above 2.4 GHz under load. (You need HWP_MODE and possibly Disable_BDPROCHOT, if anyone's interested).
But other than that, waaaay better compared to ..70 laptops, and some models seem to beat maxed out t440p-s. Also quicksync massively speeds up video decoding/encoding, so I'm overall happy with mine so far.
Ironically fixing the CPU throttling makes the GPU problem worse. For a long time throttled didn't support the 80's and back then I could at least play Tomb Raider when playing off of battery.
x380 for the 2 in 1 gimmick!