Hardware Spec Index

Caldera PW-4855 Ultra 850W 80 PLUS Gold ATX Power Supply

Power Supplies · Caldera · SKU PW4855-ULTRA · Released 2021 · Updated 2026-10-19

Key facts

Benchmark index1,990 (Power Supplies scale)
Category rank#31,013
Street price$179
Power850 W (rated)
Performance per dollar11.12
Released2021

Specifications

BrandCaldera
ModelCaldera PW-4855 Ultra
Rated output850 W continuous
Efficiency80 PLUS Gold (90% at 50% load, 115 V)
StandardATX 12V 2.53
GPU powerNone
PCIe 8-pin3×
Form factorATX
ModularityFully modular
Fan140 mm fluid dynamic bearing, zero-RPM mode
Hold-up time≥ 16 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

Similar Power Supplies

ModelBenchmarkPriceCompare
Teralux PW-5705 Ultra 1300W 80 PLUS Platinum ATX 3.1 Power Supply2,782$399Compare
Caldera PW-7251 Plus 850W 80 PLUS Gold ATX 3.0 Power Supply1,467$89Compare
Zephyra PW-2690 Core 1000W 80 PLUS Platinum ATX Power Supply2,258$229Compare
Zephyra PW-7837 Pro 1000W 80 PLUS Gold ATX 3.0 Power Supply2,102$209Compare
Novexa PW-4535 Ultra 750W 80 PLUS Bronze SFX Power Supply995$49Compare
Caldera PW-8566 Core 750W 80 PLUS Gold ATX 3.1 Power Supply1,540$119Compare

All Power Supplies · JSON

Cite this page: Hardware Spec Index, “Caldera PW-4855 Ultra 850W 80 PLUS Gold ATX Power Supply”, https://vextor7.com/item/119052 (accessed 2026-10-19).