Bios almost always has to be updated so that everything runs optimally. Nevertheless, the PC will also start with the 5600x without a BIOS update. The 7600x is AM5, a different socket. So this mainboard only fits the 5600x and earlier versions. For 7xxx you have to buy AM5 boards. In addition, RAM is different: 5xxx has DDR4, 7xxxx has DDR5.