Hardware Spec Index

Caldera PW-9381 Ultra 550W 80 PLUS Bronze ATX Power Supply

Power Supplies · Caldera · SKU PW9381-ULTRA · Released 2019 · Updated 2026-10-22

Key facts

Benchmark index977 (Power Supplies scale)
Category rank#40,578
Street price$49
Power550 W (rated)
Performance per dollar19.94
Released2019

Specifications

BrandCaldera
ModelCaldera PW-9381 Ultra
Rated output550 W continuous
Efficiency80 PLUS Bronze (85% at 50% load, 115 V)
StandardATX 12V 2.53
GPU powerNone
PCIe 8-pin2×
Form factorATX
ModularitySemi-modular
Fan140 mm fluid dynamic bearing, zero-RPM mode
Hold-up time≥ 16 ms
ProtectionsOCP, OVP, UVP, OPP, OTP, SCP
Warranty7 years

Related guides

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

Similar Power Supplies

ModelBenchmarkPriceCompare
Zephyra PW-5623 Ultra 750W 80 PLUS Gold ATX 3.0 Power Supply1,394$89Compare
Zephyra PW-9182 XT 850W 80 PLUS Gold ATX 3.1 Power Supply1,705$129Compare
Teralux PW-5796 Plus 750W 80 PLUS Gold ATX 3.1 Power Supply976$49Compare
Vantrel PW-5450 Core 850W 80 PLUS Gold ATX Power Supply1,491$109Compare
Vantrel PW-6541 Ultra 1000W 80 PLUS Titanium ATX 3.1 Power Supply2,237$229Compare
Caldera PW-9939 Ultra 1000W 80 PLUS Platinum ATX 3.1 Power Supply1,966$169Compare

All Power Supplies · JSON

Cite this page: Hardware Spec Index, “Caldera PW-9381 Ultra 550W 80 PLUS Bronze ATX Power Supply”, https://vextor7.com/item/294524 (accessed 2026-10-22).