Corsair iCUE H150i Elite LCD XT Liquid CPU Cooler - for most high-end CPUs.

ARCTIC Liquid Freezer III 360 is currently best AIO for 14900KS.

If you're looking for the best liquid cooler to pair with the Intel Core i9-14900KS, here are a few top recommendations:

1. Arctic Liquid Freezer II 420

• Massive 420mm radiator provides excellent cooling performance
• VRM fan helps cool motherboard components
• Quiet pump operation and PWM-controlled fans
• Great value for the performance

2. EK-AIO Elite 360 D-RGB

• Premium all-in-one liquid cooler with 360mm radiator
• Stylish RGB fans and pump head
• High-performance pump and fans provide great cooling
• Robust software control for customizing performance and lighting

3. Corsair iCUE H150i Elite LCD

• 360mm radiator delivers excellent thermal dissipation
• High-performance pump with customizable LCD screen
• Quiet ML RGB fans with zero RPM mode
• User-friendly iCUE software for controlling fan speeds and RGB

4. Alphacool Eisbaer Aurora 420 CPU

• Huge 420mm copper radiator for superior cooling
• Powerful DC-LT pump provides great flow rate
• Fans optimized for high static pressure
• Expandable with quick-release fittings for adding GPU block

5. Lian Li Galahad AIO 360

• Sleek 360mm aluminum radiator design
• High-performance pump and quiet fans
• Attractive RGB lighting on fans and pump cap
• Easy to install and fills via dedicated fill port

Those are five of the best 360mm and 420mm liquid coolers that can handle the thermal demands of the i9-14900KS. The larger 420mm options will provide the best cooling headroom, but all of these AIOs deliver excellent performance, quiet operation, and customizable RGB aesthetics.

I have NZXT Kraken Elite 360mm RGB for my 14900K, works great, but a bit expensive.