Hardware Spec Index

Caldera CL-5903 Ultra 420mm AIO Liquid CPU Cooler

CPU Coolers · Caldera · SKU CL5903-ULTRA · Released 2025 · Updated 2026-10-26

Key facts

Benchmark index2,376 (CPU Coolers scale)
Category rank#43,878
Street price$199
Power17 W
Performance per dollar11.94
Released2025

Specifications

BrandCaldera
ModelCaldera CL-5903 Ultra
TypeAll-in-one liquid cooler
Radiator420 mm, aluminum, 27 mm thick
Fans3× 140 mm, up to 1,800 RPM
Pump3,300 RPM
Rated cooling330 W (manufacturer rating)
Noise29 dBA (max)
Tubing400 mm, sleeved EPDM
Socket supportAM5, AM4, LGA1851, LGA1700
Warranty5 years

Related guides

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Cite this page: Hardware Spec Index, “Caldera CL-5903 Ultra 420mm AIO Liquid CPU Cooler”, https://vextor7.com/item/16360358 (accessed 2026-10-26).