Let's see cards in computers that I am using right now, a pci-e 1x slot passive cooled AMD HD 5450, Galax 1060, AMD R7 260x that are in use. One in Gnu/Linux the HD 5450, others Win10 boxes. Have a Asus GT630 in my stash that was replaced with the R7 card.
On a side note, that AMD HD 5450 is running on an AM3 platform and is actually a 1x pci-e card, bought it like back in 2012 or something to fill a refurbished HP computer that had no x16 slot. Worked great back then but not so much now, as driver bugs won't allow me to hibernate, or sleep due to opensource bugs in my distro. Card is great, have it in x16 slot works well, but comp is on all time and seeing if I can kill the card due to heat stress.
Seriously that computer is hot use it to crunch science, outside case is hot to touch, cpu temps says like 73 degree C, but still going. Yes I have 2 intake fans, and 1 exhaust fans all 120MM exhaust air temp is warm, but not hot. Just summer, and average temp in the room it's in probably like 80-85 degrees F, I use portable AC when I am in the room so stay cool, but when not home or outside room is hot, maybe in 95-100 degree F range, just seeing if one day when get home it is killed by heat, or motherboard turned it self off. But know in winter won't need heat in my room, and will be toasty.