ATX 3.1 Power Supplies
ATX 3.1 power supplies are the current standard, built to handle the power spikes of modern graphics cards and featuring the native 12V-2×6 (PCIe 5) connector. Our ATX 3.1 range covers efficient, reliable units from trusted brands across a range of wattages. All in UK stock with a full warranty and a live price on each listing. If you are buying a new GPU, an ATX 3.1 PSU is the safe, future-ready choice. See our power supply guide for help.
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ASUS TUF Gaming 1000W 80 PLUS Gold ATX 3.1 Fully-Modular Power Supply Unit Black
In stock
£133.98 inc VAT- 1000W output with 80 PLUS Gold efficiency for PC
- ATX 3.1 and PCIe 5.1 compatibility
- Fully-modular cabling for flexible installation
- Active cooling with a 13.5 cm ball bearing fan
- Military-grade capacitors for enhanced durability and lifespan
- Comprehensive power protection features including OVP, OCP, OPP, SCP, UVP, OTP
- 8-year warranty for long-term reliability
ASUS ROG STRIX 1200P 1200W ATX PSU
In stock
£238.18 inc VAT- 1200W total power output
- 80 PLUS Platinum certification for high efficiency
- Active cooling system with one fan
- Fully-modular cabling for easy management
- ATX 3.1 compliance with native 12V-2×6 connector
- Multiple power protection features including over current and short circuit
- GaN MOSFET for premium power efficiency
Corsair RM1000x Shift 1000W ATX 3.1 PCIe 5.1 Gold Modular PSU
In stock
£160.61 inc VAT- 1000W Total Power Output with single +12V rail
- 80 PLUS Gold and Cybenetics certified efficiency
- Revolutionary side-mounted modular connections for easy cable management
- ATX 3.1 compliant for high reliability and power efficiency
- 140mm fluid dynamic bearing fan with Zero RPM mode for quiet operation
- Includes 7x 6+2 Pin PCIe and 16x SATA power connectors
- Compatible with ATX PSU format cases at least 210mm wide
ASUS ROG THOR 1000P3 1000W 80 PLUS Platinum ATX PSU Black
In stock
£337.43 inc VAT- 1000W total power with 80 PLUS Platinum certification for high efficiency
- ATX 3.1 version and fully-modular cabling for flexible installation
- Illumination and an OLED display with magnetic attachment
- Integrated ROG Equalizer 12V-2×6 PCIe power cable to reduce heat stress
- Advanced power protection features including over current and short circuit
- Dedicated CPU, PCIe, SATA, and Peripheral (Molex) cables included
ASUS ROG THOR 1200P3 1200W ATX Power Supply
In stock
£396.97 inc VAT- 1200W total power output for PC systems
- 80 PLUS Platinum and Cybenetics Platinum certifications
- ATX 3.1 version with fully-modular cabling
- Active cooling with a single fan and illumination
- OLED display with magnetic attachment
- Integrated ROG Equalizer 12V-2×6 PCIe power cable
- Comprehensive power protection features
Asrock PG-1000G 750W ATX PSU Black
In stock
£224.11 inc VAT- 750 W ATX 3.1 & PCIe 5.1 compliance for future-proof builds
- 80 PLUS Gold efficiency with Cybenetics Lambda A acoustic certification
- 13.5 cm FDB fan with iCOOL intelligent fan control mode
- Fully-modular cabling with 9 SATA, 5 PCIe 6+2 pin and 2 EPS connectors
- Comprehensive power protection including over current, voltage, heat and short circuit
- 10-year warranty with 100,000 h MTBF for long-term reliability
Asrock PG-1600G 1600W ATX PSU Black 20+4 pin
In stock
£236.42 inc VAT- 1600 W total power with ATX 3.1 and PCIe 5.1 compatibility
- 80 PLUS Gold certification for high energy efficiency
- Fully-modular cabling with 12 SATA, 8 PCIe 6+2 pin, and 2 EPS connectors
- 13.5 cm Fluid Dynamic Bearing fan with iCOOL intelligent fan control
- Comprehensive power protection including over current, voltage, and overheating
- 100,000 h MTBF with 10-year warranty for long-term reliability
Asrock PG-1300G 1300W ATX PSU Black 20+4 Pin
In stock
£180.42 inc VAT- 1300 W total power with ATX 3.1 and PCIe 5.1 compatibility
- 80 PLUS Gold efficiency with Cybenetics Lambda A acoustic certification
- 13.5 cm FDB fan with iCOOL intelligent fan control mode
- Fully-modular cabling with 9 SATA and 6 PCIe 6+2 pin connectors
- Comprehensive power protection including over current, voltage and overheating
- 10-year warranty with 100,000 h MTBF
Asrock PRO-750B 750W ATX PSU Black
In stock
£51.53 inc VAT- 750 W total power with 80 PLUS Bronze efficiency
- Active 12 cm fan cooling
- ATX form factor with ATX 3.1 support
- Non-modular cabling with 24-pin ATX and EPS 4+4 pin connectors
- PCIe 12+4 pin, 6+2 pin, plus 4 SATA and 2 Molex connectors
- Comprehensive protection suite with 100,000 h MTBF
- 3-year warranty
Asrock PRO-850B 850W ATX PSU Black
In stock
£60.49 inc VAT- 850 W ATX 3.1 PC power supply unit with 80 PLUS Bronze certification
- Active 12 cm fan cooling with 100,000 h MTBF
- Non-modular cabling with 24-pin ATX, EPS 4+4 pin and 12+4 pin PCIe connectors
- Power protection against over current, short circuit, over voltage, under voltage, overheating and over power
- Black 150 x 140 x 86 mm unit with 3-year warranty
Asrock PRO-650G 650W ATX PSU Black
In stock
£57.14 inc VAT- 650 W ATX 3.1 PC power supply unit
- 80 PLUS Gold efficiency certification
- Active cooling with 12 cm fan
- Comprehensive power protection suite
- 24-pin ATX, 4+4 pin CPU and 6+2 pin PCIe connectors
- 3-year warranty with 100,000 h MTBF
Asrock PRO-850G 850W ATX PSU Black
In stock
£72.84 inc VAT- 850 W ATX 3.1 power supply unit with 80 PLUS Gold efficiency
- Active cooling via 12 cm fan with 100,000 h MTBF
- Black finish with dual colour design and green connectors for easy verification
- Comprehensive protection features including over current, short circuit and overheating
- Connectors include 24-pin ATX, 4+4 pin CPU, 1x 12+4 pin PCIe and 2x 6+2 pin PCIe
- Three-year warranty with 100–240 V AC input and 60 cm motherboard cable
Asrock PRO-750G 750W ATX PSU Black
In stock
£64.98 inc VAT- 750 W ATX 3.1 power supply unit for PC systems
- 80 PLUS Gold efficiency certification for reduced energy waste
- Active cooling with 12 cm fan and 100,000 h MTBF
- Comprehensive power protection including over current, short circuit and overheating
- Connectors: 24-pin ATX, 4+4 pin CPU, 12+4 pin PCIe and 2x 6+2 pin PCIe
- 3-year warranty with dual colour connectors for easy installation check
Antec NeoEco 850W Platinum Modular ATX 3.1 PSU, PCIe 5.1, 12V-2×6
In stock
£92.42 inc VAT- 850W ATX 3.1 Power Supply
- 80 PLUS Platinum certified efficiency
- PCIe 5.1 ready with 12V-2×6 connector
- Fully modular design for clean cable management
- 120mm FDB silent fan with Zero RPM mode
- High-
Antec NE1200 Platinum NeoEco 1200W ATX 3.1 PSU, PCIe 5.1, 80 Plus Platinum, 10-Year Warranty
In stock
£123.24 inc VAT- 1200W ATX 3.1 & PCIe 5.1 compatibility with 12V-2×6 connector
- 80 PLUS Platinum efficiency with high-quality Japanese capacitors
- PhaseWave server-class DC-DC design for stable power delivery
- Full modular cable management for improved airflow
- 120mm FDB silent fan with Zero RPM Manager for quiet cooling
- 10-year warranty with comprehensive industrial-grade protection suite
- Compact 140mm x 150mm x 86mm size fits wider case compatibility
be quiet! POWER ZONE 2 1000W ATX Black PSU
In stock
£130.38 inc VAT- 1000 W ATX 3.1 power supply unit with 80 PLUS Platinum efficiency
- 14 cm Pure Wings 3 fan with rifle bearing and 27.2 dB noise level
- Fully-modular cabling with 1x 12V-2×6 and 3x 6+2-pin PCIe connectors
- Single +12V rail delivering 83.3 A with 1070 W peak power
- Comprehensive protection features including over current, over voltage and overheating
- Key specs check: MTBF 100,000 h, hold time 22.7 ms, operating temp 0–40 °C
be quiet! PURE POWER 12 850W ATX Black PSU
In stock
£78.02 inc VAT- 850 W total power with 900 W peak and ATX 3.1 compliance
- 80 PLUS Gold efficiency at 90.5% with active PFC 0.98 power factor
- 12 cm fan with rifle bearing for 25.1 dB active cooling
- ATX form factor with 20+4 pin motherboard and 4+4 pin CPU connectors
- PCIe 5.1 compatibility with 12-pin and three 6+2 pin connectors
- Non-modular cabling with 6 SATA and 1 Molex peripheral connectors
- 10 year warranty with comprehensive power protection features
be quiet! Pure Power 13 M 650W ATX Black PSU
In stock
£72.01 inc VAT- 650W ATX 3.1 and PCIe 5.1 compliant power supply for PC builds
- 80 PLUS Gold efficiency with 92.8% rating and active PFC
- 12 cm fan with 0–1800 RPM speed and 30.2 dB noise level
- Fully-modular cabling with PCIe 12-pin and 6+2 pin connectors
- Comprehensive protection including over current, over voltage and surge
- 100,000 h MTBF with rifle bearing and semi-passive cooling
be quiet! POWER ZONE 2 1200W ATX PSU Black
In stock
£168.52 inc VAT- 1200 W total power with 80 PLUS Platinum efficiency
- ATX 3.1 and PCIe 5.1 compatibility for next-gen GPUs
- Fully-modular cabling with 1200 W on the +12V rail
- 14 cm rifle-bearing fan with 0–2100 RPM speed
- Active cooling at 25.5 dB with semi-passive zero-RPM mode
- Comprehensive protection: over current, over power, over voltage, overheating, short circuit, surge & inrush, under voltage
Cooler Master MWE Gold 550 V3 550W 80+ Gold Non-Modular ATX PSU
In stock
£53.88 inc VAT- Cooler Master MWE Gold 550 V3 550W 80+ Gold PSU
- ATX 3.1 support with durable 12V-2×6 cable
- Single +12V rail for consistent power output
- Quiet 120mm HDB fan for effective cooling
- Non-modular design with embossed cables
- High temperature resilience up to 40°C
- 5-year warranty included
ATX 3.1 Power Supplies Buying Guide and FAQ
This ATX 3.1 Power Supplies range groups units by this feature. Below are the common questions.
What does ATX 3.1 mean on a power supply?
A ATX 3.1 PSU meets the latest ATX 3.1 standard, which is designed for the power spikes modern graphics cards can draw and provides the native 12V-2x6 (12VHPWR) connector. It is a useful feature to look for when matching a unit to a modern build.
Do I need a ATX 3.1 power supply?
If you are fitting a current high-end Nvidia graphics card, a unit with the right connector is the cleaner choice and avoids adapters. Match the feature to your parts and case.
What wattage and rating should I pair with it?
Choose wattage around your graphics card, roughly 650 to 750W for mid-range and 850W and up for high-end, and aim for a reputable 80 Plus Gold unit. That combination suits most gaming PCs.