Rated Excellent
4.8 star rating
Free delivery over £50
to most of the UK
0% interest for 4 months
on purchases over £99
Custom PCs built fast
delivered in 4-5 days
3 year on-site PC warranty*
including parts & labour

GameMax GP400A 400W 80+ Bronze PSU

CCL Code: PSU1397
Manufacturer Code: GP-400A
| Manufacturer: GameMax

Key Features:

  • 2x Molex Connectors
  • 3x SATA Connectors
  • 1x PCIe Connectors (6+2-Pin)
  • 4 + 4-Pin CPU Power Connector
  • ATX Form Factor

Delivery Options (from £4.99)

Wednesday 20th October via Priority DPD

Thursday 21st October via Royal Mail Tracked 24

Collection Options

Wednesday 20th October from Local Collection Point

Was £144.98

SAVE £113

Now only


inc VAT

Hurry, only 2 left!

Buying in bulk or need help? Email our Business Team.


GameMax performance range power supplies are a great choice if you are building a home or office system as a mainstream model, there is a total of 3 Sata connectors for Raid storage and up to 85% efficiency for power saving and a single +12V rail for extreme CPU/GPU power consumption. Good DC quality with lower ripple and noise and fully protected functions are used to guard your components in the system. When installing there is no struggle with the longer 20 + 4 pin and 4 + 4 pin connectors measuring 550mm.

Main Features

  • Elegant black PSU casing with full black mesh cables
  • ATX12V Ver.2.30 compliant with ATX12V Ver.2.31
  • High efficiency PSU, up to 85% efficiency
  • Single 12V Rail for high compatibility and extreme high current output
  • Longer 20 + 4 and 4 + 4 pins up to 550mm is easy for high-end tower chassis installation
  • 12cm silent black fan with smart thermal fan speed control circuit
  • Full protection functions with OVP / UVP / OPP / SCP / SIP
  • Safety and EMC certified by CE
  • ECO friendly by RoHS and Erp 2013 directives


SATA Connectors 3
CPU Connectors 1 x 4+4-pin ATX 12V
PCI Connectors 1 x 6+2-pin PCIe
Motherboard Connectors 1 x 20+4-piin ATX
Molex Connectors 2


Standards 80+ Bronze


Power 400 W


Form Factor ATX Power Supply
Width 150 mm
Depth 140 mm
Height 85 mm
Weight 1.2 kg

Key Features

Modular Cables No
80Plus Rated 80 Plus Bronze
PSU Form Factor ATX
PCI-E Connectors 1
Motherboard Power Connectors 4 + 4-Pin
PCI-E Pin Type 6+2-Pin
PSU Depth 140 mm
ETA Efficiency Cert. Not Rated
Lambda Noise Cert. Not Rated


Warranty 1 Year

Item Details

Manufacturer GameMax
Manufacturer Code GP-400A
EAN 6931858720021
Condition New

Warranty Information

Warranty 1 Year

Manufacturer Information

Manufacturer GameMax
Manufacturer Code GP-400A
Questions and Answers

Do you have you a question about the GameMax GP400A (400W) 80 Plus Bronze ATX Power Supply?

3 / 5 3 reviews


6 months ago

Reliable and affordable power supply

Will Unknown

November 2018

Completely useless psu. New pc build already shutting down at random because of this power supply. Waste of money.

Mrs barbara dunn

October 2018

I purchased this to repair a pc that had problems, it turned out not to be the psu that that was the cause.but I am still happy I got this as it is a lot quieter and has less vibration than the original psu.I was surprised at the build quality and performance of this unit for the money,it is not whisper quiet but very easy to live with.As I said I am very happy with this and for the price very good value.