be quiet! Pure Power 12 M 850W PSU Review

Part Analysis

General Data
Manufacturer (OEM) HEC
PCB Type Double-Sided
Primary Side
Transient Filter 4x Y caps, 3x X caps, 2x CM chokes, 1x MOV TVR14471
Inrush Protection NTC Thermistor SCK205R0 & Relay HF46F-G
Bridge Rectifier(s)

2x

APFC MOSFETs
3x Infineon IPAW60R180P7S (600V, 11A @ 100°C, Rds(on): 0.18Ohm)
APFC Boost Diode
1x Infineon IDH08G65C6 (650V, 11A @ 125°C)
Bulk Cap(s)
2x Teapo (400V, 470μF each or 940μF, 2,000h @ 105°C, LG)
Main Switchers
2x Infineon NCE65TF099F (650V, 24A @ 100°C, Rds(on): 0.109Ohm)
APFC Controller
CM6500UNX AT6101ZS
Resonant Controller Champion CM6901T6X
Topology
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs 6x PWC012N04ES
5V & 3.3V DC-DC Converters
Filtering Capacitors Electrolytic:
14x Teapo (3,000 @ 105°C, SC)
1x Elite
Polymer: 28x Elite
Supervisor IC Weltrend WT7527RT (OCP, OVP, UVP, SCP, PG)
Fan Model be quiet! BQ QF2-12025-HS (120mm, 12V, 0.30A, Rifle Bearing Fan)
5VSB Circuit
Rectifier
1x PFR10V45CT SBR (45V, 10A)
Standby PWM Controller Excelliance MOS EM8569D

The OEM is HEC, trying to enter the high-end platforms club. The PCB is small but uses large heatsinks to keep the cooling fan’s speeds low, thus restricting noise output. The VRMs handing the minor rails are installed onto a large daughter board to save space, while the 12V FETs are on the PCB’s solder side. Typically, a half-bridge topology is used along with an LLC resonant controller. On the secondary side, we only find Teapo SC caps, which don’t have high specs, and lots of polymer caps by Elite. Given the ten-year warranty that covers this product, I expected to find better caps on the secondary side. The same goes for the fan that uses a rifle bearing, not a fluid dynamic one.

Given that, be quiet! products are most popular in the EU market, especially Germany, where 230V input is standard, and the operating conditions are normal; without extremely hot weather, the Teapo SC caps will survive the ten-year warranty, but at 100-115V voltage input and high operating temperatures, it won’t be as easy. Still,  I believe be quiet! put the numbers down before it decided to offer such an extended warranty in all markets. At some point, I will have to run my cap endurance tests to find out what is happening. My industry contacts tell me that the use of high-end Japanese caps is primarily for marketing and doesn’t serve a real purpose since even an extended ten-year warranty is possible for not caps without fancy specs, but this is something that I cannot confirm.

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12 thoughts on “be quiet! Pure Power 12 M 850W PSU Review

  1. After having coil whine on Vertex Gx 1200 which i paid 350 EUROS i bought the Be quiet 12M 1000w 205 Euros for my rtx 4090 and there is no more coil whine or buzzing in sleep or idle.

    Im happy with it for now.

  2. I wish you could review the MSI MPG A850G PCIE5 psu which is the closest competitor in terms of price and specs.

  3. Hi aris, are these non japanese caps enough to discard the psu considering the overall performance? It’s the cheapest atx 3.0 psu in europe, rmx shift and toughpower gf3 are 50€ more expensive.

    1. If the price difference is that large, go for the be quiet! unit. These guys seem to trust it a lot, to give it such a long warranty, after all.

    2. Does this review apply to the 1000 watt version too? I’m not very knowledgeable so I don’t know if quality varies a lot between versions.

  4. Just a note on this PSU – the 24pin ATX Power Cable is only 550mm long so can be a very tight fit in a mid sized case like the Phanteks P600S.

    1. I should add that I also value customer service and RMA simplicity in Europe, tbh I only heard bad things about TT support and good things about be quiet, which could flip the balance even if TT GF3 is the better unit.

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