XPS 8940, GPU choices

I am looking to buy a XPS 8940 and I settled on:

10th Gen Intel Core i7-10700 processor
32GB, 2x16GB, DDR4, 2933Mhz
1TB M.2 PCIe NVMe SSD
500W Black Bezel Chassis inc ODD

Now for the GPU. My options are:

GTX 1660 Ti
RTX 2060 6GB
RTX 2060 Super 8GB
Radeon RX 5600

From another post I understand that 1660 Ti is double width and renders the adjacent PCIe x4 slot unusable. Is the same true for the other three?

Noise will be important to me. Do you think it will be any significant noise/heat difference between the 4 cards, under normal use? If any of the other three cards are not double width (so PCIe x4 may be used) and are as good (or better) than GTX 1660 Ti, I would be inclined to upgrade. For my needs, quiet operation for the entire system under non-gaming use is more important than peak performance in gaming. In a previous question I had, I have been told by an user which has a similar system with the 1660 Ti that air flow is fine and "noise-level is non-existent". Will it likely be the same with any of the other three cards?

Any advice on this is much appreciated!