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be quiet! Pure Power 12 550W vs Cooler Master GX3 850W: Comparison
be quiet! Pure Power 12 550W and Cooler Master GX3 850W separate most on wattage: be quiet! Pure Power 12 550W at 550 W, Cooler Master GX3 850W at 850 W, 35% in favour of Cooler Master GX3 850W. PCIe 8-pin Connectors splits them by another 33%, again favouring Cooler Master GX3 850W. They match on 9 other specifications, including 80 plus rating, atx standard and form factor. On price, be quiet! Pure Power 12 550W sits at $74.99 against $109.99 for Cooler Master GX3 850W.
Specs
| Specification |  |  |
|---|---|---|
| Brand | be quiet! | Cooler Master |
| 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 |
| 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, 1x EPS 4+4, 1x EPS 8-pin, 1x 12V-2x6, 3x PCIe 6+2-pin, 8x SATA, 4x Molex |
| Fan Size | 120 mm | 135 mm |
| Fan Model / Bearing | 120mm be quiet! fan, rifle bearing | 135mm (Hong Hua HA13525H12F-Z) |
| EPS 8-pin Connectors | 1 | 2 |
| SATA Connectors | 5 | 8 |
| Molex Connectors | 1 | 4 |
| Cable Lengths | 24-pin 600mm, max cable length 550mm | 24-pin 610mm, EPS 600mm, PCIe 550mm, 12V-2x6 650mm, SATA 500+120+120+120mm, Molex 500+120+120+120mm |
| 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 | OPP, OVP, OTP, OCP, SCP, UVP, Surge & Inrush |
| Warranty | 10 years | 10 years |
| Model | Pure Power 12 550W | GX III Gold 850 |
| Typical Price | $74.99 | $109.99 |
| Source URL | https://www.bequiet.com/en/powersupply/5684 | https://www.coolermaster.com/en-global/products/gx-iii-gold-850-atx-3-1.html |
Price comparison
| Retailer | be quiet! Pure Power 12 550W | Cooler Master GX3 850W |
|---|---|---|
| Amazon | $74.99 View on Amazon | |
| Newegg | View on Newegg | |
| Consumercarts listing | $109.99 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.
Cooler Master GX3 850W
8.3 / 10 Expert Rating
A solid 850W Gold-rated ATX unit for a popular RTX 4070 Ti / RTX 5070-class gaming build, held back only by the usual mid-tier compromises on cabling and OEM sourcing.
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