Power supply · MODEL NOTES
CORSAIR RM850x ATX 3.1 (CP-9020270-NA)
A useful choice when three separate conventional GPU cable runs matter
RM850x CP-9020270-NA is worth comparing when the system fits its 850 W capacity and the exact GPU connection plan benefits from three documented conventional PCIe cable runs. That is a meaningful distinction from simply counting plug ends on another supply. Its 160 mm body needs more room than the 140 mm RMe alternative, so check the case and drive-cage arrangement before selecting it.
Consider it when
- An 850 W-class build with a GPU requiring independently routed conventional power leads.
Look again when
- The case cannot spare the required depth or a smaller supply already meets the complete requirement.
THE SPACE IT NEEDS
Leave room beyond the PSU body
- PSU body length
- 160mm
The body length excludes the working space needed for plugs and cable bends. Drive cages and the case layout can reduce that space.
Check power and cable requirements ↗Based on the manufacturer specification record, checked . Check the exact revision and installation instructions before buying.
The checks that can change your choice
This is standard RMx ATX 3.1, not SHIFT or the 2021 model
The recorded model includes three conventional PCIe cable runs, two EPS runs and Type 4 wiring. The native 16-pin cable’s wattage was not independently established for this exact capacity, so confirm that separately if needed. Never transfer cable approval from a similarly named series without manufacturer evidence.
Check the whole power path
Compare the CPU and exact graphics card requirements with the PSU capacity and included connector arrangement. Count independent cable runs where the GPU manual requires them. Use only cables approved for this exact power supply; similar-looking modular plugs do not establish compatible wiring.
Published specifications
850 W fully modular ATX PSU; ATX 3.1 / PCIe 5.1; Type 4 cables; native 12V-2x6; 160 × 150 × 86 mm.
| Brand | CORSAIR |
|---|---|
| Exact model | RM850x ATX 3.1 (CP-9020270-NA) |
| Manufacturer model number | CP-9020270-NA |
| Hardware revision | 2024 ATX 3.1 series |
| Form factor | ATX |
| PSU rated output | 850 W |
| PSU body length | 160 mm; cable connectors need additional space |
| Direct PCIe 6+2-pin ends | 3 |
| Independent direct PCIe cables | 3 |
| Native 16-pin GPU cable | 1 supplied connection(s) · 12V-2x6; use the exact model’s supplied cables |
| CPU EPS 8-pin ends | 2 |
| Independent EPS cables | 2 |
| SATA power connectors | 8 |
| SATA power cables | 2 |
Exact CP-9020270-NA standard RMx model, not SHIFT or the 2021 revision. Includes 3 separate conventional PCIe 6+2 cables and two EPS 4+4 cables. Use only cables approved for this exact PSU. Native 16-pin cable wattage was not independently established for this exact wattage variant.
A different choice worth checking
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Follow the check that matters to your build
Sources and review notes
RigAtlas connects manufacturer specifications to component choices. This page is document-based analysis; it does not claim a hands-on test or a current store offer.
- CORSAIR — exact model specificationsEvidence checked
- CORSAIR — supporting specification or manualEvidence checked
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