Hardware Spec Index

Zephyra PW-4778 Prime 850W 80 PLUS Bronze SFX Power Supply

Power Supplies · Zephyra · SKU PW4778-PRIME · Released 2022 · Updated 2026-10-20

Key facts

Benchmark index1,203 (Power Supplies scale)
Category rank#21,440
Street price$69
Power850 W (rated)
Performance per dollar17.43
Released2022

Specifications

BrandZephyra
ModelZephyra PW-4778 Prime
Rated output850 W continuous
Efficiency80 PLUS Bronze (85% at 50% load, 115 V)
StandardATX 3.0 / PCIe CEM 5.0
GPU power1× 12VHPWR (600 W)
PCIe 8-pin2×
Form factorSFX-L
ModularityNon-modular
Fan120 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, “Zephyra PW-4778 Prime 850W 80 PLUS Bronze SFX Power Supply”, https://vextor7.com/item/1594487 (accessed 2026-10-20).