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With working I mean GNU/Linux temperatures should not exceed Windows' ones by 10 C° with low performance profile.

Preferably powersaving support over multi monitor configurations should be present into free driver.

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    Note that my RX 580 Radeon graphics card does not spin up when supporting multiple monitors. If you require discrete graphics without any particular 3D support you could look at NVidia GT 710 which is supported out of the box on Linux, it seems. Those are usually passive cards, so even under load it should not use too much. There is even a newer one with 4 x HDMI output (although the supported resolutions are rather low, it's more for multiple TV sized screens it seems). – Maarten Bodewes Jun 28 at 19:00
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    RX 580 is about 200 euro, RX 550 only somewhat below that. Mine sports a "fan stop" option, which you can configure in Linux. The GT 710 can be found starting at 40 euro here in NL (!) and the multiple HDMI one should be about 70-80-ish. But I don't have any specific power usage data on it. – Maarten Bodewes Jun 28 at 19:03
  • I have a 4-head (1 HDMI + 3 DVI) setup split on two Radeon 5850: on windows I get temperatures up to 55C with all monitors on, while on GNU I get 55C and 60C with 2 (1 monitor per card with dpm on) and an astonishing 65C and 72C (with low profile since dpm does not work when multiple monitors are connected) with everything on. Basically I wanted to be sure to pick up a card that did not suffer from this problem. – Scrooge McDuck Jun 28 at 20:26
  • Of course I meant in idle. – Scrooge McDuck Jun 28 at 20:27

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