Computer Power Supplies
Computer Power Supplies are the heart of your PC, delivering clean, stable power to the CPU, graphics card, storage, and cooling so everything runs fast and reliably. Since 1988 our UK based online shop has helped builders pick the right PSU with clear compatibility advice, honest specs, fast UK delivery, and easy returns.
- Computer Power Supplies
Asus ROG Strix 1000W Platinum PSU, Fully Modular, 80+ Platinum, ATX 3.1, PCIe 5.0, GaN MOSFET, Intelligent Voltage Stabilizer
Original price was: £239.90.£199.99Current price is: £199.99. *View On Amazon* - Computer Power Supplies
Cooler Master V850 SFX Gold, UK Plug – 850W 80 PLUS Gold, Fully Modular Power Supply Unit, SFF/mini-ITX PSU, Semi-Fanless Mode, SFX-to-ATX Bracket, 10 Year Warranty, Black Edition, Quiet 92 mm FDB Fan
Original price was: £130.16.£122.36Current price is: £122.36. *View On Amazon* - Computer Power Supplies
JUSTOP Black ATX 500W PSU, Switching Power Supply, Computer Desktop PC, 120mm Fan, 4+4-Pin 12V, 6x SATA
Original price was: £24.99.£22.50Current price is: £22.50. *View On Amazon* - Computer Power Supplies
CORSAIR CX650 80 PLUS Bronze Non Modular Low-Noise ATX 650 Watt Power Supply – UK – Black
£56.48 *View On Amazon* - Computer Power Supplies
Tacens Anima APSIII500, Power Supply PC SFX 500W, SMD Technology 85% Bronze 12V, Ultra-quiet 9cm Fan, Black
£34.00 *View On Amazon* - Computer Power Supplies
Bewinner One S Power Supply, 100-240V AC Adapter, Quiet & Durable, Easy to Install, Professional Replacement Power Board
Original price was: £40.82.£38.51Current price is: £38.51. *View On Amazon* - Computer Power Supplies
AeroCool Integrator 500 W 80 Plus Bronze Power Supply Unit with UK 3 Pin Power Lead , Black
£41.98 *View On Amazon* - Computer Power Supplies
Corsair RM750e (2023) Fully Modular Low-Noise ATX Power Supply – ATX 3.1 & PCIe 5.1 Compliant – 105°C-Rated Capacitors – 80 PLUS Gold Efficiency – Modern Standby Support – Black
Original price was: £107.95.£103.95Current price is: £103.95. *View On Amazon* - Computer Power Supplies
GameMax 600W Rampage Power Supply (No Power Cable inc.), Non-Modular, APFC, Japanese Tk Main Capacitor, 80 Plus Bronze, 88% Efficiency, 14cm Cooling Fan, Real Power Gaming | Black
Original price was: £42.49.£35.40Current price is: £35.40. *View On Amazon* - Computer Power Supplies
HDKEAN Computer Power Supply 500W Small Desktop PC Cash Register Power Low-power Equipment 500w
£58.04 *View On Amazon* - Computer Power Supplies
CORSAIR RM1000x SHIFT Fully Modular ATX Power Supply – 80 PLUS Gold – ATX 3.1 – PCIe 5.1 – Zero RPM – Modular Side Interface – White
Original price was: £179.99.£168.26Current price is: £168.26. *View On Amazon* - Computer Power Supplies
Switching Power Supply PSU 500W ATX with 12cm Silent Black Fan/for PC Computer/iCHOOSE
£22.50 *View On Amazon*
Choose a quality ATX or SFX PSU sized for your parts. Aim for 80 Plus Gold efficiency, 650 to 750 W for mid gaming, 850 to 1000 W for high end GPUs, and modular cables for tidy builds. Look for ATX 3.0 or 3.1 with a 12V-2×6 cable for modern graphics cards, plus protections like OCP, OVP, SCP, OTP. Check case fit in mm, cable lengths, and EPS 8-pin count for your motherboard.
Why buy computer power supplies from us
UK online retailer since 1988 with friendly, expert guidance
Curated range across ATX, SFX, and SFX-L in 450 W to 1600 W
Clear compatibility notes for ATX 3.0 or 3.1, 12V-2×6, PCIe 6+2, EPS 8-pin, and case fit
Tested picks with quiet fans, low ripple, and premium capacitors
Fast UK delivery, easy returns, and UK based aftercare
PSU types at a glance
ATX – standard desktop size for most mid and full towers
SFX and SFX-L – compact units for Mini ITX and small form factor builds
Non-modular – fixed cables for budget systems
Semi-modular – essential cables fixed, the rest detachable
Fully modular – all cables are detachable for the cleanest build
80 Plus ratings – Bronze, Silver, Gold, Platinum, Titanium for higher efficiency
Computer power supply buying guide
1) Size the wattage correctly
Use the GPU and CPU as the main drivers. Leave headroom for spikes and future upgrades.
| Build type | Typical parts | Recommended PSU |
|---|---|---|
| Home and office | Integrated graphics, 6-core CPU | 450 to 550 W |
| 1080p gaming | Core i5 or Ryzen 5 + mid GPU | 650 W |
| 1440p gaming | 8-core CPU + upper mid GPU | 750 to 850 W |
| 4K gaming and creator | High end GPU + 8 to 16-core CPU | 850 to 1000 W |
| Extreme or dual GPU | Flagship GPU or multi drives | 1000 to 1200 W plus |
2) ATX 3.0 or 3.1 and the 12V-2×6 connector
Prefer ATX 3.0 or 3.1 for modern transient spikes and cleaner delivery
Use native 12V-2×6 cables for new GPUs where supported
If your GPU needs 6+2 PCIe plugs, ensure the PSU includes enough connectors and amps on the 12 V rail
3) Efficiency and heat
80 Plus Gold is the smart sweet spot for most builds
Platinum or Titanium suits heavy, always-on systems
Higher efficiency cuts waste heat and usually reduces fan noise
4) Quality and protections
Look for low ripple, good voltage regulation, and full protection set:
OCP over current, OVP over voltage, UVP under voltage, SCP short circuit, OTP over temperature, OPP over power.
Premium Japanese capacitors and a long warranty are signs of quality.
5) Form factor, length, and cables
ATX length varies, commonly 140 to 180 mm. Check case clearance and space behind the shroud
SFX and SFX-L fit small cases. SFX-L is longer and often quieter
Cables: confirm 24-pin ATX, 1 or 2 EPS 8-pin, PCIe count, SATA, and Molex for accessories
Consider sleeved or flat ribbon cables and the required lengths for large cases
6) Noise and cooling
Look for semi-passive fan modes that stop the fan at low load
Larger 120 mm or 135 mm fans spin slower and stay quieter
A tidy case with cool intake air keeps the PSU fan running slowly
Quick picks by scenario
| Need | Our tip | Why |
|---|---|---|
| Best value gaming | 750 W 80 Plus Gold ATX 3.0 with 12V-2×6 | Handles most 1440p builds quietly |
| High end 4K rig | 1000 W Gold or Platinum with dual EPS | Headroom for spikes and future GPUs |
| Small form factor | 750 W SFX-L Gold, fully modular | Short cables, quiet larger fan |
| Creator workstation | 850 W to 1000 W Platinum, low ripple | Stable rails for long renders |
| Quiet PC | 650 W Gold with semi-passive fan curve | Near silent at idle and light loads |
| Budget office | 500 W Bronze from a reputable brand | Reliable and efficient for iGPU PCs |
Common mistakes to avoid
Picking too little wattage and tripping protections under load
Buying a cheap, no-name unit with poor protection and ripple
Forgetting EPS 8-pin count for higher end motherboards
Ignoring case length clearance for long ATX units
Using old modular cables on a new PSU of a different brand
Overlooking ATX 3.0 or 3.1 support for new GPUs
Choosing non-modular in a glass case, then fighting cable clutter
Mounting the PSU with the fan against solid surfaces that block the intake
Setup, safety, and care
Mount the fan down if your case has a filtered bottom intake
Use the supplied modular cables only, and seat them fully until the latch clicks
Route cables cleanly to avoid strain on connectors
Keep the bottom dust filter clean to maintain airflow
Pair with a surge protector or a small UPS for brownout protection
Check PSU screws and cable seating after transport
Replace very old PSUs when upgrading to power hungry GPUs
Popular sub categories
ATX 3.0 or 3.1 power supplies
SFX and SFX-L power supplies
80 Plus Gold PSUs
Platinum and Titanium PSUs
Fully modular PSUs
Sleeved cable kits and extensions
UPS and surge protection
FAQs – Computer Power Supplies
1) What size PSU do I need
Match to your parts. 650 to 750 W suits most mid gaming PCs. 850 to 1000 W suits high end GPUs and creators who want headroom.
2) Is 80 Plus Gold worth it
Yes. Gold balances efficiency, heat, and cost well for most systems.
3) Do I need ATX 3.0 or 3.1
Recommended for modern GPUs and transient spikes. You also get a native 12V-2×6 cable on many models.
4) What is the 12V-2×6 connector
The modern high power GPU plug. It replaces older 12-pin styles and improves contact and safety when fully seated.
5) Will an SFX PSU power a high end PC
Yes, if wattage and connectors match. SFX-L often runs quieter thanks to a larger fan.
6) Can I reuse old modular cables
Do not mix modular cables between brands or models. Pinouts vary and can damage parts. Use the cables supplied with your PSU.
7) Do two EPS 8-pin connectors matter
High end motherboards and CPUs may require two EPS 8-pin plugs. Check your board manual.
8) Why is my PSU fan always on
Many units keep the fan spinning at low speed for cooling. Some have a semi-passive mode that stops the fan at low load.
9) How close to maximum wattage can I run
Plan around 50 to 70 percent typical load for best efficiency and noise, with headroom for spikes.
10) Which way should the PSU fan face
Usually fan down to draw cool air from the bottom filter. Fan up only if the bottom vent is blocked.
11) Will a Gold PSU save money on power
It reduces wasted energy and heat over time. Savings depend on usage hours and local electricity rates.
12) What protections should I look for
OCP, OVP, UVP, OPP, SCP, and OTP are key safeguards.
13) Do I need a UPS
A UPS protects against power cuts and brownouts and lets the PC shut down safely. It is recommended for important work.
14) How long does a PSU last
Quality units can last many years. Replace if you hear coil whine or fans failing, or when upgrading to much higher loads.
15) My PC reboots under load. Could it be the PSU
Yes. It could be insufficient wattage, a failing unit, poor cables, or transient spikes. Check connections and consider a higher quality PSU.
16) Are fully modular PSUs better for airflow
Usually yes. You only plug in what you need, which reduces clutter and improves airflow.
17) What cable lengths do I need for big cases
Look for 600 to 700 mm EPS and PCIe cables for tall cases or rear-routed paths.
18) Will a Platinum PSU run cooler and quieter
Often, because less power is wasted as heat. The fan can spin slower for the same load.
19) Can I power two GPUs
Only if the PSU has the wattage and enough PCIe connectors. Check the total 12 V capacity and GPU requirements.
20) Do you include a UK power lead
Retail PSUs typically include a power lead. Check the product contents on the listing.
Ready to power your build
Explore computer power supplies in ATX, SFX, and SFX-L with 80 Plus Gold or better, modular cables, and ATX 3.0 or 3.1 support. With expert advice, clear fit notes, fast UK delivery, and trusted service since 1988, you can build a cooler, quieter, and more reliable PC.
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