Corsair

Corsair CP-9020062-UK RM1000 1000W Power Supply

Name: Corsair CP-9020062-UK RM1000 1000W Power Supply
Brand: Corsair
SKU: CP-9020062-UK

★★★★★4.4 (121 reviews)

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.

Check availability

Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

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

Pros & Cons

👍 Pros

At 1000W continuous output rated to 40°C ambient, the RM1000 provides the sustained power delivery that overclocked multi-GPU or HEDT workstation builds demand without throttling under thermal stress.
80 PLUS Gold efficiency at 87–90% across load ranges meaningfully reduces heat output and operating costs over the unit's lifespan compared to Bronze-rated alternatives.
Fully modular cabling eliminates every unused cable from the build, directly improving airflow efficiency in the chassis — a tangible engineering advantage, not just a cosmetic one.
The single +12V rail design simplifies power distribution across multiple high-current components, avoiding voltage imbalance issues that can occur with multi-rail implementations under mixed loads.
Corsair's Zero RPM fan mode keeps the unit completely silent at low-to-medium loads, only spinning the fan under heavy sustained draw.

👎 Cons

This is a pre-ATX 3.0 design and lacks a native 12VHPWR connector — users pairing it with latest-generation NVIDIA GPUs requiring that connector will need an adapter, which introduces a potential point of failure if the adapter is low quality.
At 1000W capacity, the RM1000 commands a premium price that single-GPU mainstream builders won't fully utilize — the efficiency case for running at 50% load is real, but the cost-per-watt is not optimal for sub-600W systems.
The UK model designation (CP-9020062-UK) should be verified against your region's power requirements and plug standard before purchase if importing.
Physical dimensions are typical for a high-wattage PSU — verify clearance in smaller mid-tower cases before ordering, as the unit depth can be tight in compact enclosures.

Frequently Asked Questions

What is the 80 PLUS certification level of the RM1000, and what does that mean in practice?

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.

Is the RM1000 fully modular?

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.

What is the continuous power output rating, and at what temperature?

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.

Will this PSU be overkill for a single-GPU gaming build?

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.

Does the RM1000 support ATX 3.0 or PCIe 5.0 connectors?

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.