Hardware Spec Index

Caldera PW-4427 Ultra 850W 80 PLUS Gold ATX 3.1 Power Supply

Power Supplies · Caldera · SKU PW4427-ULTRA · Released 2024 · Updated 2026-10-24

Key facts

Benchmark index1,996 (Power Supplies scale)
Category rank#43,314
Street price$159
Power850 W (rated)
Performance per dollar12.55
Released2024

Specifications

BrandCaldera
ModelCaldera PW-4427 Ultra
Rated output850 W continuous
Efficiency80 PLUS Gold (90% at 50% load, 115 V)
StandardATX 3.1 / PCIe CEM 5.1
GPU power1× 12V-2x6 (600 W)
PCIe 8-pin2×
Form factorATX
ModularityFully modular
Fan120 mm fluid dynamic bearing, zero-RPM mode
Hold-up time≥ 17 ms
ProtectionsOCP, OVP, UVP, OPP, OTP, SCP
Warranty10 years

Related guides

80 PLUS Efficiency Ratings ExplainedATX 3.1 Power Supplies and the 12V-2x6 Connector

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Cite this page: Hardware Spec Index, “Caldera PW-4427 Ultra 850W 80 PLUS Gold ATX 3.1 Power Supply”, https://vextor7.com/item/72321778 (accessed 2026-10-24).