Power Supply
be quiet! Pure Power 12 M 850W 80+ Gold
● In Stock
Price on enquiry · Message us for today’s quote
Most power supplies are judged from a metre away, under a desk, with a wall between you and them. This one is built for the machine that sits on the desk at the same height as your ears, where merely acceptable becomes something you notice all evening. be quiet! spend their engineering on the fan blade and the bearing for exactly that case, and it tells most at the middling loads a machine actually spends its day at. 850W of Gold-rated output on ATX 3.1 behind it.
Key Specs
Output — 850W
Efficiency — 80 PLUS Gold
Standard — ATX 3.1, PCIe 5.1 ready
Noise — Very low, silence optimised fan
Cabling — Fully modular
Best for — Quiet desk-side builds
Warranty — Full manufacturer warranty
What It Pairs With
A Ryzen 7 or Core Ultra 7 with a mid to upper-tier graphics card sits comfortably inside 850W. What matters more for the result is the rest of the build: a case with damped panels, and case fans set to a curve rather than run flat out, because otherwise the supply is not the thing you are going to hear. Fully modular cabling helps here for a reason beyond tidiness — a clear airflow path keeps every fan in the machine turning slower, this one included.
Who This Isn’t For
A machine that lives in a cupboard, on the floor, or in another room gets no return on what this unit spends its budget on. The acoustic work is the product here, and distance achieves the same result for nothing. It is also the wrong bracket for a build with a flagship card and a heavily loaded processor: at that draw the fan is working hard enough that the quiet it was designed around stops being reachable, and you would be paying for a goal the workload will not let it meet.
Common Questions
Does the fan stop completely at idle?
No — this one runs very slowly rather than switching off altogether. If a fan that stops dead is specifically what you want, say so in the enquiry and we will point you at a unit built that way instead.
Will it be the quietest thing in my build?
At normal loads it will usually sit below the case fans and the graphics card, so it is rarely what you end up hearing. If the machine is loud today, the supply is unlikely to be the culprit — tell us the symptoms and we will help you find it.
Does 850W leave me room to upgrade the card later?
Some, depending on what you move to and what processor is alongside it. Tell us what you are running now and what you have in mind and we will say plainly whether the supply comes with you or not.
Send your graphics card, processor and case model with the enquiry and we will confirm the wattage bracket and that the housing fits the space you have. Availability confirmed at time of quote.