Hardware Spec Index

Caldera PW-3991 Max 650W 80 PLUS Gold ATX Power Supply

Power Supplies · Caldera · SKU PW3991-MAX · Released 2019 · Updated 2026-10-24

Key facts

Benchmark index1,055 (Power Supplies scale)
Category rank#18,664
Street price$59
Power650 W (rated)
Performance per dollar17.88
Released2019

Specifications

BrandCaldera
ModelCaldera PW-3991 Max
Rated output650 W continuous
Efficiency80 PLUS Gold (90% at 50% load, 115 V)
StandardATX 12V 2.53
GPU powerNone
PCIe 8-pin2×
Form factorATX
ModularityFully modular
Fan135 mm fluid dynamic bearing, zero-RPM mode
Hold-up time≥ 16 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

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Cite this page: Hardware Spec Index, “Caldera PW-3991 Max 650W 80 PLUS Gold ATX Power Supply”, https://vextor7.com/item/915413 (accessed 2026-10-24).