Hardware Spec Index

Caldera CL-6688 Ultra 420mm AIO Liquid CPU Cooler

CPU Coolers · Caldera · SKU CL6688-ULTRA · Released 2021 · Updated 2026-10-25

Key facts

Benchmark index1,933 (CPU Coolers scale)
Category rank#12,708
Street price$139
Power17 W
Performance per dollar13.91
Released2021

Specifications

BrandCaldera
ModelCaldera CL-6688 Ultra
TypeAll-in-one liquid cooler
Radiator420 mm, aluminum, 27 mm thick
Fans3× 140 mm, up to 2,200 RPM
Pump3,100 RPM
Rated cooling330 W (manufacturer rating)
Noise31 dBA (max)
Tubing400 mm, sleeved EPDM
Socket supportAM4, LGA1700, LGA1200, LGA115x
Warranty5 years

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Cite this page: Hardware Spec Index, “Caldera CL-6688 Ultra 420mm AIO Liquid CPU Cooler”, https://vextor7.com/item/6923052 (accessed 2026-10-25).