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Corsair

Corsair CP-9020062-UK RM1000 1000W Power Supply

Fully modular 1000W at 80 PLUS Gold efficiency — the Corsair RM1000 delivers clean, stable power for the most demanding multi-GPU and high-core-count builds.

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Overview

The Corsair RM1000 is a fully modular, 1000W ATX power supply built around an 80 PLUS Gold efficiency certification and a single +12V rail architecture. The Gold rating is not marketing shorthand — it means the unit converts 87% or more of AC input to usable DC output at typical loads, with peak efficiency climbing above 90% at 50% load. That efficiency figure translates directly to reduced heat generation inside the chassis and lower operating costs over the unit's lifespan, which matters in high-draw systems that log significant uptime hours. The single +12V rail design delivers all available current through one regulated path, which simplifies stable power delivery to CPU, GPU, and storage simultaneously without the current-balancing complexity of multi-rail designs.

The RM1000 is built for the top end of consumer and prosumer system builds: overclocked high-core-count workstations, dual-GPU rendering rigs, or any system where sustained power draw under heavy computational load is the norm rather than the exception. The fully modular cable system means a builder in a full-tower workstation chassis routes only what's needed — ATX, EPS CPU, PCIe, and SATA/Molex runs without a tangle of unused cables degrading airflow. For the right build profile — high-sustained-draw, thermal-conscious, clean-build-oriented — the RM1000 delivers exactly what its specification promises. It's a unit that tends to stay in systems through multiple build generations, which is the most practical endorsement a PSU can earn.

Specifications

Model
RM1000
Wattage
1000W

Frequently Asked Questions

The RM1000 carries 80 PLUS Gold certification, meaning it operates at 87–90% efficiency across typical load ranges. In practice, less than 10% of drawn power is wasted as heat — reducing electricity costs and thermal load inside the case compared to Bronze or unrated units.
Yes — all cables, including the ATX 24-pin motherboard connector, are detachable. This means you only route the cables your build actually needs, which directly improves airflow and simplifies cable management in mid-tower and full-tower cases.
The RM1000 is rated for 1000W continuous output. Corsair rates this at 40°C ambient, which is meaningful — many lower-tier PSUs are rated at a cooler 25°C lab temperature that doesn't reflect real-world case temperatures under sustained load.
For a single high-end GPU like an RTX 4090 paired with a modern high-core-count CPU, 1000W is appropriate and provides meaningful headroom for overclocking. For mid-range single-GPU systems drawing 400–600W, it is over-specced — though PSUs run more efficiently at 40–60% load, so the efficiency trade-off is minimal.
This is the original RM1000 (CP-9020062-UK), which predates ATX 3.0 and native PCIe 5.0 connector support. It uses standard PCIe 6+2-pin connectors. For cards requiring the 12VHPWR connector, an adapter will be needed — Corsair recommends verifying adapter compatibility with your specific GPU.

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