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be quiet! Pure Power 12 550W vs Corsair RM850x: Comparison
be quiet! Pure Power 12 550W and Corsair RM850x separate most on wattage: be quiet! Pure Power 12 550W at 550 W, Corsair RM850x at 850 W, 35% in favour of Corsair RM850x. PCIe 8-pin Connectors splits them by another 33%, again favouring Corsair RM850x. They match on 10 other specifications, including 80 plus rating, atx standard and form factor. On price, be quiet! Pure Power 12 550W sits at $74.99 against $149.99 for Corsair RM850x.
Specs
| Specification |  |  |
|---|---|---|
| Brand | be quiet! | Corsair |
| Wattage | 550 W-35% | 850 W |
| 80 PLUS Rating | Gold | Gold |
| ATX Standard | ATX 3.1 | ATX 3.1 |
| Form Factor | ATX | ATX |
| +12V Rail Amperage | 45.8 A | 70.8 A |
| Single +12V Rail | Yes | Yes |
| PCIe CEM Standard | PCIe 5.1 | PCIe 5.1 |
| 12V-2x6 Connectors | 1 | 1 |
| Zero-RPM Mode | No | Yes |
| Sleeved Cables | Yes | No |
| PCIe 8-pin Connectors | 2-33% | 3 |
| Connector Count | 1x 24-pin ATX, 1x EPS 4+4, 1x 12V-2x6, 2x PCIe 6+2-pin, 5x SATA, 1x Molex (all fixed) | 1x 24-pin ATX, 2x EPS 4+4, 3x PCIe 6+2-pin, 1x 12V-2x6, 8x SATA, 3x Molex |
| Fan Size | 120 mm | 140 mm |
| Fan Model / Bearing | 120mm be quiet! fan, rifle bearing | 140mm fluid dynamic bearing (NR140HP) |
| OEM / Platform | HEC | CWT |
| EPS 8-pin Connectors | 1 | 2 |
| SATA Connectors | 5 | 8 |
| Molex Connectors | 1 | 3 |
| Length | 160 mm | 160 mm |
| Colour | Black | Black |
| Fan Bearing | Rifle | Fluid Dynamic |
| MTBF | 100000 hours | 100000 hours |
| Modularity | Non-Modular | Fully Modular |
| Protections | OTP, OCP, OPP, SCP, OVP, UVP, SIP | OCP, OVP, OPP, SCP, OTP, UVP |
| Warranty | 10 years | 10 years |
| Model | Pure Power 12 550W | RM850x (2024, ATX 3.1) |
| Typical Price | $74.99 | $149.99 |
| Source URL | https://www.bequiet.com/en/powersupply/5684 | https://www.corsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-na |
Price comparison
| Retailer | be quiet! Pure Power 12 550W | Corsair RM850x |
|---|---|---|
| Amazon | $74.99 View on Amazon | |
| Newegg | View on Newegg | |
| Consumercarts listing | $149.99 View on Consumercarts listing |
Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.
Verdict
be quiet! Pure Power 12 550W
7.8 / 10 Expert Rating
A quiet, Gold-rated 550W unit that's the right call for mainstream builds that don't need full modularity.