Summary of Reddit Comments on Best AIO for AM5:

Arctic Liquid Freezer II and III

• Arctic Liquid Freezer II or III are recommended as the best AIOs on the market in terms of noise, cooling, and warranty support.
• Pros:
  • "Arctic Liquid Freezer II or iii are indeed currently the best aio’s on the market."
  • "thicker rad than most other aio’s"
• Cons:
  • "Their pump speed is relatively slow compared to others and is never going to be the top performer."
  • Some believe they are overpriced due to greed.

Arctic Liquid Freezer III 360

• Arctic Liquid Freezer III 360 is recommended for cooling AM5 CPUs.
• Pros:
  • "Liquid Freezer III 360 + Montech King 95 Pro."
• Cons:
  • "There doesn't seem to be an easy way to fit the LF 420 into the Tower 500. It's too big."

Other Recommendations

• For AM5 sockets, if a cooler fits AM4, it will fit AM5.
• An air cooler may be sufficient for Ryzen CPUs: "you won't even need an AIO for ryzen. an air cooler will do the job just fine."
• Consider CoolerMaster's Atmos 360, Lian Li Galahad II Trinity 360, and EK-AIO CR360 Lux D-RGB as top AIO options.

General Advice

• Liquid Freezer II is recommended by users.
• Consider whether you specifically need a water cooler or if a budget air cooler could suffice.
• Setting BIOS limits for CPU temperature may help manage high temperatures during use.

Overall, the Arctic Liquid Freezer II and III are highly regarded for their performance, noise levels, and warranty support, while other options like CoolerMaster's Atmos 360 are also mentioned as top choices. It's important to consider the size of the AIO when choosing one, as larger models may not fit some cases. Users also mention that for AM5 sockets, coolers compatible with AM4 should work as well.