There's no new chipset, just updated AGESA code.
Published: 31st May 2021 | Source: ASUS | Author: Mark Campbell

ASUS reveals the secret behind AMD's new Passive X570 motherboards
ASUS has confirmed that they have four new passive X570 motherboards in the works, updated mainboard designs, which eliminate the need for a chipset fan, increasing the long-term reliability of these motherboards while eliminating a potential source of system noise.
ASUS' planned X5








