There is no definitive answer for this question since there are a variety of different AIOs (all-in-one) that are available for the Ryzen 7 5800X. Some of the best AIOs on the market include the Corsair H100i RGB Platinum, NZXT Kraken X62, and the Thermaltake Floe Riing RGB 360 TT Premium Edition. Ultimately, it depends on your personal preferences as to which AIO is best for you.