The biggest cost variable is the block. 9070xt blocks can only be bought new, can only be bought from one place, and the only ones in stock (From what I gather back ordering anything is something like a year out unless you already did and i haven’t) are the less popular more expensive cards. There are used cards but they are the same cost as new (so new is a no brainer)So the block is $250 and the card is $840. You can get a new card cheaper, but you can’t get a block for it. To get both you gotta buy the pricey card.
The 4080fe is the card with the most available used block. So it’s like $900-$1100 and the block is $50-$80. They’re really close to the same price. But only if you watercool. There are cheaper 4080s but block availability is catch-as catch-can, and the blocks tend to be more expensive during the short window they are available