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Dell XPS 15's and Precisions 55xx's allow this trick.

You can buy them from the manufacturer with no discrete graphics cards.

I have one with a card which is physically turned off for the same trick.

Do you mean the XPS 13? I've never seen an XPS 15 in recent years without an NVIDIA card. The cheapest XPS 15 from 2019 that I can find still comes with the mobile NVIDIA GeForce GTX 1650, as does my own XPS 15 9560 from 2017.

I'm 2 days late! I'm so sorry!

If you go to dell.com and select one of the more entry level varients you can customise more things:

https://i.imgur.com/deQFdyU.png

In my experience the XPS 15 7390 with the 6c12t cpu with Windows had the fan running very often. Each time a single cpu thread ran at 100% the fan turned on.

The thinkpad T470/T480 dual-pipe dGPU heatsink is a drop-in replacement for the iGPU version, so if you buy the version without dGPU, you can pretty easily double your heatpipes quite cheap.

[0]: https://www.reddit.com/r/thinkpad/comments/9ohpyo/psa_t470t4...

Not OP, but from experience I know the Razer Blade Stealth 13 has the same cooling for both integrated GPU and dedicated gpu versions - and it's a very beefy cooling system as is, even with the dedicated gpu the system can stay at full load indefinitely without any issues.