Hardware Spec Index

Caldera PW-8421 Ultra 850W 80 PLUS Bronze ATX 3.1 Power Supply

Power Supplies · Caldera · SKU PW8421-ULTRA · Released 2026 · Updated 2026-10-20

Key facts

Benchmark index1,519 (Power Supplies scale)
Category rank#33,182
Street price$89
Power850 W (rated)
Performance per dollar17.07
Released2026

Specifications

BrandCaldera
ModelCaldera PW-8421 Ultra
Rated output850 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-pin2×
Form factorATX
ModularitySemi-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
Caldera PW-9994 Prime 1300W 80 PLUS Platinum ATX 3.0 Power Supply2,607$309Compare
Vantrel PW-4073 Max 1600W 80 PLUS Titanium ATX 3.1 Power Supply2,980$399Compare
Caldera PW-9924 Ti 1000W 80 PLUS Gold ATX 3.1 Power Supply1,767$119Compare
Vantrel PW-1503 Ti 850W 80 PLUS Gold ATX Power Supply1,454$89Compare
Novexa PW-6354 Max 1200W 80 PLUS Platinum ATX 3.1 Power Supply2,645$279Compare
Zephyra PW-6941 XT 650W 80 PLUS Gold ATX 3.1 Power Supply947$39Compare

All Power Supplies · JSON

Cite this page: Hardware Spec Index, “Caldera PW-8421 Ultra 850W 80 PLUS Bronze ATX 3.1 Power Supply”, https://vextor7.com/item/3974741 (accessed 2026-10-20).