Computer Case Power Supply 400w
Overview
Product sourcing insights & recommendations
The 400W computer case power supply market in 2026 has transitioned into a specialized niche focused on budget office PCs, Small Form Factor (SFF) builds, and energy-efficient Home Theater PCs (HTPCs). While mid-range consumers are pivoting toward 750W+ units, 400W remains a critical segment for builds where the 50% load "efficiency sweet spot" (drawing ~200W) is prioritized for silent, cool operation AlibabaTomshardware.
Key Market & Product Trends
- ATX 3.1 & 12V-2x6 Adoption: Even lower-wattage units are adopting ATX 3.1 standards to ensure better transient response and native compatibility with modern entry-level GPUs without adapters NeweggNewegg.
- SFF/Mini-ITX Momentum: There is rising demand for SFX 400W units as compact gaming builds gain popularity, particularly those using low-power GPUs like the RTX 4060 Alibaba.
- Efficiency Polarization: The market is splitting between low-cost OEM/Bronze units (priced around $10–$16) and premium 80 Plus Gold/Cybenetics certified models (targeting $25–$55) that emphasize reliability and Japanese capacitors AlibabaAlibaba.
- Feature Creep: Modern 400W units are increasingly offering high-end features like full modularity, flat black cables, and Zero-Fan modes to cater to aesthetics and silent operation PcworldAlibaba.
Sourcing Landscape
I have identified several product categories matching your criteria, from bulk OEM office supplies to high-efficiency gaming grade units.
Detailed specifications, wholesale pricing, and supplier locations can be found in the attached files.
- Budget ATX Options: High-volume desktop units starting as low as $10.90/piece for bulk orders Alibaba.
- Specialized SFX Units: Compact power solutions for Mini-ITX cases with high efficiency ratings Alibaba.
- High-End 400W Gold: Active PFC units with 80 Plus Gold certification for professional or high-stability environments Alibaba.
I have compiled the 400W PSU market insights and product lists. You can continue with:
Budget Desktop Atx Psu 400w Wholesale
Products · 3 lists
PC/Computer/Desktop ATX Power Supply 400w 12v Atx Power Supply
Shenzhen Shunxinjie Industrial Co., Ltd.verified🇨🇳CN22 yrs
OEM Factory Direct 400W ATX 3.1 Full Modular 12V 5A 180-240V High Efficiency EMC Desktop Office PC Power Supply
Shenzhen Yijian Technology Co., Ltd.verified🇨🇳CN5 yrs
Cheap ATX PC Desktop Psu 400W Computer Power Supply
Shenzhen Tianfeng International Technology Co., Ltd.verified🇨🇳CN6 yrs
Zumax APFC 80PLUS 1U Flex ATX 401W-500W Used Power Supply for Server/Desktop NAS Chassis Mini Power Supply with 2 Years Warranty
Dongguan Worldwide Electronic Technologies Co., Ltd.verified🇨🇳CN13 yrs
GTEENLEAF ATX Desktop Server Computer Power Supply 600W 80 Plus Bronze PSU High Efficiency APFC 14cm Fan OEM 24Pin 700W Stock
Boluo Xurong Electronics Co., Ltd.verified🇨🇳CN5 yrs
SNOWMAN 400W 80 Plus Gold Certified ATX Power Supply for Gaming Desktop & Server in Stock
Dongguan Wan Yuan Electronic Technology Co., Ltd.verified🇨🇳CN2 yrs
SAMA APFC 400W ATX Switching Power Supply Desktop Home/office Computer Power Supply ATX
Guangzhou AOJIE Science & Technology Co., Ltd.verified🇨🇳CN16 yrs
High Efficiency Computer ATX 400W Power Supply 80plus Bronze OEM PSU
Dongguan Soeyi Technology Limitedverified🇨🇳CN9 yrs
SNOWMAN 400W 80 Plus Bronze Certified ATX Power Supply 20+4Pin for Desktop & Server PC in Stock
Dongguan Bingman Electronic Technology Co., Ltd.verified🇨🇳CN5 yrs
Power Supply 400W PSU ATX PC Power Supply Server Case PSU for HP ATX-250-12E ATX-300-12E ATX-300-12E-D
Shenzhen Sibaite Electronics Co., Ltd.verified🇨🇳CN18 yrs
2025 New Style PSU ATX 500/600/700/800W High Efficiency Power Supply for Computers Quiet Cooler 24pin 2*8pin Servers Desktops
Dongguan Cooling Electronic Technology Co., Ltd.verified🇨🇳CN5 yrs
300w 400w 500w 600w 700w 800w 1000w Atx Computer Desktop Active Pc Power Supply 500w Pc Atx Power Supply Pc
Huizhou Longzhixin Electronic Technology Co., Ltd.verified🇨🇳CN2 yrs
Power Supply 24V 48V 30V Dc 30A Usv Magnetron Computer Atx Power Supplies Pc 500-700W Computer Acc for Pc Gaming
Dongguan Chengliang Intelligent Technology Co., Ltd.verified🇨🇳CN13 yrs
ATX Computer Desktop Pc Power Supply 300W 350W 400W 450W 500W 600W PSU OEM Case Custom Status Logo Item Pin WORK AMD Support EMC
Dongguan Hongyi Hardware Electronic Technology Co., Ltd.verified🇨🇳CN6 yrs
Wholesale OEM FLEX200W ATX Computer Power PC 300W ITX 400W 1U Server Parts
Shenzhen Jindee Technology Co., Ltd.verified🇨🇳CN11 yrs
LOVINGCOOL 2025 OEM ODM 24PIN Gaming Computer ATX 400W Power Supply for Desktop PC PSU
Dongguan Qifeng Electronic Technology Co., Ltd.verified🇨🇳CN6 yrs
Gaming Computer External ATX Power Supply 250W 450W 650W 850W
Ancreu Technology Co., Ltd.verified🇨🇳CN6 yrs
ATX Computer Power Supply, 12cm Silent Fan, with CE and PPFC for Business PC System
Guangdong Sohoo Technology Co., Ltd.verified🇨🇳CN15 yrs
High Quality ATX Computer Game PSU 2000Wpsu 12V PC Desktop Power Supply in Stock for Server Application
Guangzhou Jinjie Network Technology Co., Ltd.verified🇨🇳CN4 yrs
High Quality DIY ATX 600W Switch Power Supply for Computer case PC Active 12V 5V 3.3V 20pin 24pin 4U Power
Shenzhen Bright Star Lighting Co.,Ltdverified🇨🇳CN16 yrs
OEM Style 500W 24PIN ATX GPU Power Supply 450W PC PSU Electric System Cooler for Computer Case
Dongguan Qinghai Electronics Technology Co., Ltd.🇨🇳CN10 yrs
ATX600W Switch Power Supply for Computer Server Equipment Intel Standard Professional Gold-level Computer Power Supply Supplier
Shenzhen Bright Star Intelligent Lighting Co., Ltd.verified🇨🇳CN5 yrsRelated Searches
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Sources & References
24 sources cited · Verified industry data & reports
Best Power Supplies 2026
Tom's Hardware
Here are the best power supplies for gaming PCs. These PSUs offer the best reliability, performance, and protection for your components.
Power Supply Tech 2026 | ATX 3.1 & 12V-2x6 Connector ...
Newegg
While traditional ATX power supplies remain dominant, 2026 has seen continued growth in alternative form factors addressing specific use cases.
PC Power Supply Market Size, Growth, Forecast Till 2032
Report Prime
The PC Power Supply Market is projected to reach USD 2,67 Billion in 2026, expanding at a steady CAGR of 7.99%, supported by ongoing demand for ...
Global Computer Case Power Supply Market Sustainability ...
LinkedIn · AP Market Strategy
In 2026, the market size reached USD 10.83 billion, with a forecasted expansion to USD 19.77 billion by 2035, reflecting a CAGR of 6.2% during ...
Buying a PC power supply in 2026 is weirdly easy to mess up
PCWorld
Buying a PSU for your PC this year? Learn what wattage you actually need, why efficiency matters, and which brands are worth your money.
Best 400W ATX PSU Buying Guide 2026
Alibaba
The power supply sector is projected to reach $30 billion by 2026, driven by a shift toward ATX 3.1 standards and high-efficiency certifications