the 90w psu is cutting the bottom line of psu. motherboard is the same but system is cutting other components to save power. better get the 130w. you do not need the 180w psu unless unit shipped w discrete graphics. 130 W, 4.5 mm (for 35 W CPU) 180 W, 7.4 mm (for 65 W CPU and discrete graphics)
I bought a 7080 MFF with an i3-10100T 35Watt TDP CPU. (The unit is not here yet). I see according to Dell specifications, that it could support a 65Watt CPU as well if the external PSU is 180 Watt. My question is this: If I want to swap the 35W CPU to a 65W is it enough to buy a 180W PSU (in case it comes with only a 90W or a 130W) or does the motherboard differ on a unit that has been supplied with a 65W CPU by the factory? So in other words is the motherboard the same on a 35W factory supplied unit and only the PSU is different compared to the 65W factory supplied one? (90 W, 4.5 mm (for 35 W CPU)130 W, 4.5 mm (for 35 W CPU)180 W, 7.4 mm (for 65 W CPUand discrete graphics))
Optiplex 7080 MFF 65W CPU