be quiet! Pure Power 12 M 850W PSU Review

Protection Features

OCP (Cold @ 22°C) 12V1: >57.3A (>143.25%), <11.95V
12V2: 56.7A (157.5%), 11.843V
5V: 32.4A (147.27%), 4.939V
3.3V: 31.6A (143.64%), 3.271V
5VSB: 5.8A (193.33%), 4.986V
OCP (Hot @ 37°C) 12V1: 57.3A (143.25%), 11.953V
12V2: 54.1A (150.27%), 11.869V
5V: 32.1A (145.9%), 4.937V
3.3V: 31.2A (141.82%), 3.269V
5VSB: 5.9A (196.67%), 4.981V
OPP (Cold @ 27°C) 1132.63W (133.25%)
OPP (Hot @ 37°C) 1092.62W (128.54%)
OTP ✓ (143°C @ +12V heat sink)
SCP 12V to Earth: ✓
5V to Earth: ✓
3.3V to Earth: ✓
5VSB to Earth: ✓
-12V to Earth: ✓
PWR_OK Proper operation
NLO
SIP Surge: MOV
Inrush: NTC Thermistor & Bypass relay

OCP is sky-high at both 12V rails, in reference to the official specs. There is no point, if you ask me, in having a two-rail design if you need to set OCP such high to cope with power spikes; better use a single 12V rail and get done with it. OCP is also high on the minor rails, with no reason, especially at 3.3V. Thankfully OPP is appropriately set, effectively protecting the PSU. The other protection features are present and work well.

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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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