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be quiet! Pure Power 12 550W vs Corsair RM650x: Comparison
be quiet! Pure Power 12 550W and Corsair RM650x separate most on wattage: be quiet! Pure Power 12 550W at 550 W, Corsair RM650x at 650 W, 15% in favour of Corsair RM650x. Hold-Up Time splits them by another 2%, again favouring Corsair RM650x. They match on 8 other specifications, including 80 plus rating, form factor and single +12v rail. On price, be quiet! Pure Power 12 550W sits at $74.99 against $99.99 for Corsair RM650x.
Specs
| Specification |  |  |
|---|---|---|
| Brand | be quiet! | Corsair |
| Wattage | 550 W-15% | 650 W |
| 80 PLUS Rating | Gold | Gold |
| ATX Standard | ATX 3.1 | ATX 2.x |
| Form Factor | ATX | ATX |
| Single +12V Rail | Yes | Yes |
| 12V-2x6 Connectors | 1 | 0 |
| Hold-Up Time | 16.6 ms-2% | 17 ms |
| Zero-RPM Mode | No | Yes |
| Sleeved Cables | Yes | No |
| PCIe 8-pin Connectors | 2 | 2 |
| 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, 1x EPS 4+4, 2x PCIe 6+2-pin, 6x SATA, 3x Molex |
| Fan Size | 120 mm | 135 mm |
| Fan Model / Bearing | 120mm be quiet! fan, rifle bearing | Magnetic Levitation |
| OEM / Platform | HEC | CWT |
| Cable Lengths | 24-pin 600mm, max cable length 550mm | 24-pin 610mm, EPS 650mm, PCIe 650mm, SATA 760mm |
| Length | 160 mm | 160 mm |
| Colour | Black | Black |
| 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 | RM650x (2021) |
| Typical Price | $74.99 | $99.99 |
| Source URL | https://www.bequiet.com/en/powersupply/5684 | https://www.corsair.com/us/en/p/psu/cp-9020198-na/rmx-series-rm650x-650-watt-80-plus-gold-fully-modular-atx-psu-cp-9020198-na |
Price comparison
| Retailer | be quiet! Pure Power 12 550W | Corsair RM650x |
|---|---|---|
| Amazon | $74.99 View on Amazon | |
| Newegg | View on Newegg | |
| Consumercarts listing | $99.99 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.
Corsair RM650x
8.2 / 10 Expert Rating
The 650x is Corsair's mainstream sweet spot: quiet Zero RPM idling, a 10-year warranty, and enough headroom for a mid-range gaming build without overspending on wattage you won't use.
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