Very good question. I had 3 Elgato 4k capture cards and every single one had overheating problems and it wasn't even with the other components, they were all water cooled. The card itself is just so poorly built that all sorts of streaming and recording to 1440p or 4k will render the card useless within a few months.

I therefore recommend the "AverMedia 4k". They have informed themselves well and have built thermal pads into their card. I've been using it for 3 years without any problems.