The controller is in the console itself. the memory cards are just a grouping of NAND that interfaces with the onboard controller.
I'm saying that PS5 accepts shelf SSD that have controlers so the controller of PS5 takes overhead of the process, reason why they need more than 5.5Gb/s from the external SSD.
The question would be if Sony or any other company would make SSDs that work only on PS5 (just the nand and connection without any controller) and save costs.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"