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Smooth, safe delivery of power – with the best possible efficiency at that price – is what we look for in a power supply unit. In an ideal world, they are easy to integrate and never seen or heard from again.

Seasonic Prime Titanium Fanless 600W - Simply Unrivalled

Seasonic's Prime Titanium Fanless 600W is a simply incredible feat of engineering. It's completely fanless power supply that is capable of delivering 600W of clean, stable power yet it still manages to be physically compact. Seasonic has also opted for high-grade Japanese capacitors which is great to see, and the icing on the cake is this a fully-modular unit. Oh, and did we mention it's completely fanless?

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ASUS ROG THOR 850W Platinum

Technically, the ASUS ROG THOR 850W is a top-class power supply. It uses a Seasonic design, offering high levels of efficiency and low noise levels. On top of that, ASUS ROG has kitted it out with extra features, including addressable RGB lighting and even an OLED screen. If you want a high-quality PSU with some enthusiast-oriented features, this is a top choice.

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Corsair AX850 80+ Titanium

Corsair's AX series is highly regarded within the enthusiast community, and the new AX850 80+ Titanium is technically flawless - its efficiency is stellar, ripple suppression is excellent and load regulation is rock solid. It was even capable of delivering almost 1000W under load. Sure, it's not cheap, but this unit delivers on pretty much every level. It's a fantastic all-round power supply.

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Asus ROG Thor 1200W PSU

The bigger brother of the THOR 850W, the 1250W unit is every bit as good. Not only is it the quietest 1200W unit we have tested, but it is highly efficient and comes with a 10-year warranty. It retains the Aura RGB lighting and OLED panel, too, so if you need to power a high-wattage system - perhaps with two RTX 2080 Tis running in SLI - this is both technically and aesthetically excellent.

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Corsair SF750 SFX Platinum

Targeting the small form-factor audience, Corsair's SF750 is a quality SFX unit. We saw it able to deliver almost 790W under load, while it is still impressively quiet despite its diminutive size. On top of that, it's extremely efficient - reaching Platinum certification - and is also fully modular, something that is critical when dealing with a small form-factor build. If you need a technically excellent SFX PSU, this unit from Corsair is your best bet.

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