Rank #4 in Best PC Power Supply 2026: 10 Ranked, and the Specs That Don't Add Up
be quiet! Power Zone 2 850W 80 Plus Platinum
Price and rating as shown on Amazon when we collected them. Both change.
The be quiet! Power Zone 2 850W is the fourth entry in this guide and costs £121.94. It is an ATX 3.1 unit rated at 850 Watts of continuous power on a single 12V rail, certified 80 PLUS Platinum and Cybenetics Platinum with efficiency quoted at up to 94.1%, and cooled by a single Pure Wings 3 140mm fan that switches off entirely at low load. The listing reports 4.6 out of 5 from 129 reviews.
Two numbers in that listing are worth a second look. The spec table gives 230 Volts (AC) as the Maximum Input Voltage and the identical 230 Volts (AC) as the Minimum Input Voltage, so what should be a range is filled in twice as a single figure — a figure that does at least line up with the roughly 230V UK mains. The star breakdown tells a different story from the headline count: 81 five-star, 12 four-star, 1 three-star, 3 two-star and 3 one-star ratings add up to 100, not the 129 reviews the page states. The Model Name field also reads "be quiet! Power Zone 850W", dropping the 2 from the product title. Everything below comes from the Amazon listing for this product — the manufacturer's claims and the reviewers' own words, not results from testing we carried out.
How those 129 ratings break down
An average hides its own shape. This is the spread behind the 4.6 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £121.94 |
|---|---|
| Rating | 4.6 out of 5 from 129 reviews |
| Output wattage | 850 Watts |
| Maximum input voltage (as listed) | 230 Volts (AC) |
| Minimum input voltage (as listed) | 230 Volts (AC) |
| Cooling | Air — 1 fan, Pure Wings 3 140mm, off under low load |
| Model name (as listed) | be quiet! Power Zone 850W |
| Item weight | 3.33 kg |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“Very good power supplier. Slightly more expansive than others, but in return it has superior specs. The platinum standard is not a big deal per se, but the usage of a 140mm fan instead of the usual 120mm is a very nice addition if you're seeking a low-noise build like I was doing. Virtually inaudible, no issues so far.”
Verified purchase“Das Netzteil machte bisher kleine Probleme. Es ist leise. Die Lüfterkurve läßt sich im BIOS problemlos einstellen. Ich nutze noch ein älteres PC - Gehäuse. Ich benötigte deswegen Adapter für die Stromversorgung älterer Komponenten.”
What it is up against
The rivals it was ranked against in Best PC Power Supply 2026: 10 Ranked, and the Specs That Don't Add Up.
Questions people ask
What input voltage does the be quiet! Power Zone 2 850W accept?
The listing enters 230 Volts (AC) in both the Maximum Input Voltage and the Minimum Input Voltage fields, so one figure is given rather than a range.
Does the 4.6 rating come from all 129 reviews?
The bar chart adds up to 100 ratings — 81 five-star, 12 four-star, 1 three-star, 3 two-star and 3 one-star — while the listing states 129 reviews. The 4.6 figure is what the page shows.
How much power can the be quiet! Power Zone 2 850W deliver?
850 Watts of continuous power on one 12V rail, and the listing says it handles power excursions up to double its rated power, so roughly 1,700W for short spikes.
Which connectors does it have?
It is an ATX 3.1 unit with native 12V-2x6 for PCIe 5.1 graphics cards, supplied with a 90° angled 12V-2x6 connector, plus three PCIe 6+2-pin connectors and a 20+4 pin system bus connector.
What efficiency is the be quiet! Power Zone 2 850W rated at?
It is certified 80 PLUS Platinum and Cybenetics Platinum, with the listing quoting an energy efficiency rating of up to 94.1%.
How quiet is the be quiet! Power Zone 2 850W?
The listing says the Pure Winds 3 140mm fan turns off completely under low load and needs a 2-5 minute cooldown afterwards, and describes the unit as suited to very quiet systems.
Comments
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