Hardware Spec Index

Caldera PW-6557 Ultra 550W 80 PLUS Bronze ATX 3.1 Power Supply

Power Supplies · Caldera · SKU PW6557-ULTRA · Released 2026 · Updated 2026-10-19

Key facts

Benchmark index759 (Power Supplies scale)
Category rank#32,560
Street price$39
Power550 W (rated)
Performance per dollar19.46
Released2026

Specifications

BrandCaldera
ModelCaldera PW-6557 Ultra
Rated output550 W continuous
Efficiency80 PLUS Bronze (85% at 50% load, 115 V)
StandardATX 3.1 / PCIe CEM 5.1
GPU power1× 12V-2x6 (600 W)
PCIe 8-pin1×
Form factorATX
ModularityNon-modular
Fan135 mm fluid dynamic bearing, zero-RPM mode
Hold-up time≥ 17 ms
ProtectionsOCP, OVP, UVP, OPP, OTP, SCP
Warranty5 years

Related guides

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

Similar Power Supplies

ModelBenchmarkPriceCompare
Novexa PW-4645 Prime 1000W 80 PLUS Gold ATX 3.1 Power Supply1,722$119Compare
Zephyra PW-3163 Max 1600W 80 PLUS Titanium ATX 3.1 Power Supply2,980$399Compare
Teralux PW-3146 Core 1000W 80 PLUS Platinum ATX Power Supply2,216$209Compare
Caldera PW-9037 Plus 850W 80 PLUS Gold ATX Power Supply1,713$129Compare
Novexa PW-2964 Ultra 1200W 80 PLUS Titanium ATX 3.1 Power Supply2,254$259Compare
Vantrel PW-7967 Edge 850W 80 PLUS Gold ATX Power Supply1,332$89Compare

All Power Supplies · JSON

Cite this page: Hardware Spec Index, “Caldera PW-6557 Ultra 550W 80 PLUS Bronze ATX 3.1 Power Supply”, https://vextor7.com/item/5966468 (accessed 2026-10-19).