Hardware Spec Index

Caldera PW-3891 Ultra 650W 80 PLUS Bronze ATX 3.1 Power Supply

Power Supplies · Caldera · SKU PW3891-ULTRA · Released 2026 · Updated 2026-10-21

Key facts

Benchmark index1,317 (Power Supplies scale)
Category rank#6,334
Street price$69
Power650 W (rated)
Performance per dollar19.09
Released2026

Specifications

BrandCaldera
ModelCaldera PW-3891 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
Fan135 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

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Cite this page: Hardware Spec Index, “Caldera PW-3891 Ultra 650W 80 PLUS Bronze ATX 3.1 Power Supply”, https://vextor7.com/item/8202971 (accessed 2026-10-21).