No I am talking about U.2 HGST SSDs connected with cables, they do not get powered by the card, they get powered by a sata/molex connector. Also tried through an intel backplane (connected to the caecent card) which gets powered by an ATX connector (picture below). So I don't think the problem is power. And also those HGST drives work fine on the same system using PCIe bifurcation.
But yes, cooling is a challenge. I resolved it with having big noctua fans blowing directly into the drives, keeps them under 45 deg celcius even with the fan at low speed.

But yes, cooling is a challenge. I resolved it with having big noctua fans blowing directly into the drives, keeps them under 45 deg celcius even with the fan at low speed.

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