Hardware Spec Index

Zephyra PW-4640 Ultra 850W 80 PLUS Gold SFX Power Supply

Power Supplies · Zephyra · SKU PW4640-ULTRA · Released 2021 · Updated 2026-10-18

Key facts

Benchmark index1,819 (Power Supplies scale)
Category rank#25,697
Street price$139
Power850 W (rated)
Performance per dollar13.09
Released2021

Specifications

BrandZephyra
ModelZephyra PW-4640 Ultra
Rated output850 W continuous
Efficiency80 PLUS Gold (90% at 50% load, 115 V)
StandardATX 12V 2.53
GPU powerNone
PCIe 8-pin3×
Form factorSFX-L
ModularityFully 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

Similar Power Supplies

ModelBenchmarkPriceCompare
Caldera PW-7761 Ti 850W 80 PLUS Gold ATX 3.1 Power Supply1,395$89Compare
Teralux PW-2549 Plus 1000W 80 PLUS Gold ATX Power Supply2,330$249Compare
Zephyra PW-9021 XT 750W 80 PLUS Gold ATX Power Supply1,460$109Compare
Teralux PW-1133 Plus 850W 80 PLUS Gold SFX Power Supply1,408$99Compare
Teralux PW-3017 Pro 750W 80 PLUS Gold ATX 3.0 Power Supply1,017$49Compare
Vantrel PW-4524 Core 1300W 80 PLUS Platinum ATX 3.1 Power Supply2,415$249Compare

All Power Supplies · JSON

Cite this page: Hardware Spec Index, “Zephyra PW-4640 Ultra 850W 80 PLUS Gold SFX Power Supply”, https://vextor7.com/item/714308 (accessed 2026-10-18).