Hardware Spec Index

Caldera PW-4521 Prime 650W 80 PLUS Bronze SFX Power Supply

Power Supplies · Caldera · SKU PW4521-PRIME · Released 2021 · Updated 2026-10-21

Key facts

Benchmark index735 (Power Supplies scale)
Category rank#19,652
Street price$39
Power650 W (rated)
Performance per dollar18.85
Released2021

Specifications

BrandCaldera
ModelCaldera PW-4521 Prime
Rated output650 W continuous
Efficiency80 PLUS Bronze (85% at 50% load, 115 V)
StandardATX 12V 2.53
GPU powerNone
PCIe 8-pin2×
Form factorSFX-L
ModularitySemi-modular
Fan120 mm fluid dynamic bearing, zero-RPM mode
Hold-up time≥ 16 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-4521 Prime 650W 80 PLUS Bronze SFX Power Supply”, https://vextor7.com/item/1102872 (accessed 2026-10-21).