Hardware Spec Index

Zephyra CL-3956 Ultra 420mm AIO Liquid CPU Cooler

CPU Coolers · Zephyra · SKU CL3956-ULTRA · Released 2023 · Updated 2026-10-26

Key facts

Benchmark index2,432 (CPU Coolers scale)
Category rank#27,048
Street price$189
Power17 W
Performance per dollar12.87
Released2023

Specifications

BrandZephyra
ModelZephyra CL-3956 Ultra
TypeAll-in-one liquid cooler
Radiator420 mm, aluminum, 27 mm thick
Fans3× 140 mm, up to 2,300 RPM
Pump3,000 RPM
Rated cooling330 W (manufacturer rating)
Noise30 dBA (max)
Tubing400 mm, sleeved EPDM
Socket supportAM5, AM4, LGA1851, LGA1700
Warranty5 years

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Cite this page: Hardware Spec Index, “Zephyra CL-3956 Ultra 420mm AIO Liquid CPU Cooler”, https://vextor7.com/item/14024940 (accessed 2026-10-26).