Different chip. 5080 uses the GB203, 400 (normally indicating the chip spec), A1 (revision). It's at nearly the top off the spec for that chip. When the 5080 Ti/Super comes along, it will be a new spin altogether, or a cut down GB202 (the chip used in the 5090).5080s are widley available
Not sure why there are more 5080s than 90s coz its the same chip right? but with more defunct cores, only cherry picked chips are used for 5090s?
Also if people are selling it on the bay then its because they cant return it to the retailer for a full refund, needs to be faulty or within a certain time frame.,