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J9405B |
Description: | HP MSM31x/MSM32x Power Supply |
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Return any product within 14 days of delivery if it doesn’t meet your technical or operational needs.

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All equipment includes a 30-day replacement warranty. If something goes wrong, we’ll repair or swap it — fast.

Replacements shipped in 10 days or less.
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J9405B Overview
J9405B is a high-performance power supply designed for demanding gaming and workstation applications. It delivers 850W of power through a semi-modular design in an ATX form factor, featuring an 80 PLUS Gold certification and an input voltage range of 100–240V. The unit incorporates active PFC and is cooled by a 120mm fan with dual ball bearings, while its robust suite of protections—including OCP, OVP, UVP, and OTP—ensures reliable performance under heavy loads.
J9405B offers a comprehensive range of connectors to support modern system configurations, including 1 ATX 24-pin connector, 1 EPS (CPU) 4+4 pin connector, 2 PCIe (6+2) connectors, 8 SATA power connectors, and 4 Molex connectors. With an impressive efficiency rating of 92%, sleeved cables for enhanced durability, and a solid build quality that keeps noise levels low, this power supply is ideally suited for high-end gaming rigs, workstations, and server applications.
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J9405B Specifications
Product Type | Power Supply |
Wattage | 850W |
Use Case | Workstation / Gaming |
Form Factor | ATX |
Modularity | Semi-Modular |
80 PLUS Certification | Gold |
Rail Configuration | Multi Rail |
Certifications | 80 PLUS / CE / FCC / UL / CB / TUV / RoHS |
Remote Monitoring | No |
Input Voltage | 100–240V |
Hot-Swap Capable | No |
PFC (Power Factor Correction) | Active PFC |
Fan Size | 120mm |
Fan Bearing Type | Dual Ball |
Zero RPM Mode | No |
Efficiency Rating | 92% |
Protections | OCP / OVP / UVP / OTP |
ATX 24-Pin Connectors | 1 |
EPS (CPU) 4+4 Pin | 1 |
PCIe (6+2) Connectors | 2 |
SATA Power Connectors | 8 |
Molex Connectors | 4 |
Floppy Connector | No |
Cable Type | Sleeved |
RGB Lighting | No |
MTBF (Mean Time Between Failures) | 100,000 hours |
Operating Temperature | 50°C |
Product Name | J9405B High-Performance ATX Power Supply |
Height | 5.5 inches |
Width | 5.3 inches |
Depth | 7.1 inches |
Weight | 5 lbs |
Quality Certifications
To get the detailed certification, please go to the Compliance Center.







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