Hardware Spec Index

Caldera PW-8391 Ultra 650W 80 PLUS Bronze ATX 3.1 Power Supply

Power Supplies · Caldera · SKU PW8391-ULTRA · Released 2026 · Updated 2026-10-21

Key facts

Benchmark index984 (Power Supplies scale)
Category rank#10,607
Street price$49
Power650 W (rated)
Performance per dollar20.08
Released2026

Specifications

BrandCaldera
ModelCaldera PW-8391 Ultra
Rated output650 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
Fan140 mm fluid dynamic bearing, zero-RPM mode
Hold-up time≥ 17 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
Teralux PW-9306 Plus 1000W 80 PLUS Titanium ATX 3.1 Power Supply2,468$259Compare
Vantrel PW-5005 Core 750W 80 PLUS Bronze ATX Power Supply1,350$69Compare
Novexa PW-8205 Ti 750W 80 PLUS Gold ATX 3.1 Power Supply1,063$49Compare
Teralux PW-1848 Max 850W 80 PLUS Gold ATX 3.0 Power Supply1,373$89Compare
Novexa PW-6717 Core 1600W 80 PLUS Titanium ATX 3.1 Power Supply2,791$329Compare
Teralux PW-3384 Ti 850W 80 PLUS Gold ATX 3.0 Power Supply1,519$109Compare

All Power Supplies · JSON

Cite this page: Hardware Spec Index, “Caldera PW-8391 Ultra 650W 80 PLUS Bronze ATX 3.1 Power Supply”, https://vextor7.com/item/30008656 (accessed 2026-10-21).