Corsair RM1000x (CP-9020201-NA)

The Corsair RM1000x (part number CP-9020201-NA) is the 1000 W model of Corsair's RMx Series, a line of fully modular ATX power supplies with 80 PLUS Gold efficiency. Corsair's product page describes the series as built with high-quality components to deliver Gold-level efficient power together with the cooling of a magnetic levitation fan. The headline features on the page are a fully modular cable set, a 135 mm magnetic levitation fan with a Zero RPM mode, 105 degrees C rated Japanese electrolytic capacitors and a ten-year warranty. This entry reports what Corsair publishes and nothing more: there are no test results here, no efficiency measurements of our own and no price, because Corsair's page lists no launch date and a price would be a claim we cannot source. Every figure is a manufacturer specification unless it is marked as arithmetic.

Power table and rails

Corsair's power table for the RM1000x lists an AC input rating of 100 to 240 V, an input current of 12 A to 6 A and a frequency of 47 to 63 Hz. The maximum outputs are 20 A on the +3.3 V rail and 20 A on the +5 V rail, with a combined limit of 150 W for the two, 83.3 A on the +12 V rail for 999.6 W, 0.3 A on the -12 V rail for 3.6 W and 3 A on +5 Vsb for 15 W. The total continuous power is 1000 W. Two details stand out. First, the +12 V rail carries essentially the full rating: 83.3 A multiplied by 12 V is 999.6 W, and the arithmetic matches Corsair's figure. That matters because modern processors and graphics cards draw nearly all of their power from +12 V. Second, the tech table lists a single/multiple 12 V rail toggle as No, so there is no switch to configure. Our guide on how much PSU wattage you need explains how to add up a system's components against a rating like this.

Efficiency and certification

The RM1000x is 80 PLUS Gold. Corsair says the series delivers upwards of 90 percent peak efficiency, which it links to lower noise and less heat. The page also describes Cybenetics certification, an organisation that measures efficiency and noise across the operational range using more than 1,450 different load combinations, and it defines the Gold efficiency rating as at least 87 to 91 percent depending on input voltage, with an A- noise level. It shows separate badges for 115 V and 230 V operation. Since the two certification schemes use different test methods, their tier names can differ, and this page reports each as Corsair states it. For the background on what the tiers mean, see our comparison of 80 PLUS Bronze versus Platinum efficiency.

Cooling: magnetic levitation and Zero RPM

The fan is a 135 mm unit using a magnetic levitation bearing and custom-engineered rotors, which Corsair says gives high performance, low bearing noise and superior reliability. Zero RPM mode means the fan switches off entirely at low and medium loads for near-silent operation and starts when the load rises, so that critical component temperatures stay in check. The exact load at which the fan starts is not given on the product page, so this entry does not quote one. The page lists the rated continuous output temperature as 50 degrees C and the mean time between failures as 100,000 hours. Corsair also lists Modern Standby support, explaining that precise timings allow extremely fast wake-from-sleep and better low-load efficiency.

Components and design

Corsair says each RMx Series unit uses a resonant LLC topology with DC-DC conversion, together with 105 degrees C rated, 100 percent Japanese electrolytic capacitors, and that this combination is aimed at consistent, reliable power and strong electrical performance. These are design statements from the manufacturer; they describe what is inside the unit, not how it behaves in your system. The protections listed are over-voltage, under-voltage, short-circuit, over-temperature and over-power. The unit conforms to the ATX12V v2.4 and EPS 2.92 standards according to the tech table. The page does not list ATX 3.x or a native 12V-2x6 graphics cable for this model, which is worth noting if you are pairing it with the newest graphics cards; Corsair says only that it is compatible with the 12-pin GPU power cable for new GPUs, and its accessory range includes a separate 12+4 pin cable. Our explainer on the 12VHPWR power connector gives the background on that connector.

Cables and connectors

The RM1000x is fully modular, and the cable type is listed as Type 4. Corsair says the wide range of included cables gives broad compatibility with modern graphics cards and motherboards and that the unit has multiple EPS12V connectors, which suits boards that want more than one processor power cable. The tech table lists 14 SATA connectors, and the package contents are the power supply, an AC power cord, mounting screws and cable ties. Corsair sells individually sleeved replacement cables in various colours as separate accessories, along with ARGB cable strips, so cosmetic upgrades are optional rather than required. If cable routing is a priority in your build, our guide to modular PSU cable management covers how to plan it.

Reading the rail limits together

The individual rail limits in the power table add up to more than the 1000 W rating, and that is normal. Multiplying Corsair's per-rail figures gives 66 W for the +3.3 V rail (20 A times 3.3 V) and 100 W for the +5 V rail (20 A times 5 V), a sum of 166 W, yet Corsair lists a combined limit of 150 W for the two. Adding the +12 V maximum of 999.6 W, the 150 W combined figure, 3.6 W on -12 V and 15 W on standby gives about 1,168 W (arithmetic from the table), which is more than the 1000 W total continuous power. The reason is that the rails share the same internal converter and cannot all be loaded to their individual maximums at once; the total continuous power is the binding limit. In practice this simply means that you should compare the load of your components against the 1000 W total and against the +12 V figure separately, and not add the per-rail numbers together.

Size, weight and warranty

The unit measures 150 mm by 86 mm by 180 mm and weighs 3 kg. It is an ATX form-factor supply and is listed as multi-GPU ready. The warranty is ten years, backed by Corsair's global technical support team.

Where it sits and how to compare it

The RMx name is used across several generations on this site, and the Corsair RM850x (2024) entry is a different, more recent design, so do not assume the two share specifications. This 1000 W unit lists standards up to ATX12V v2.4 on its page, whereas newer units on the market list ATX 3.x. If you want a Corsair unit with a different position in the range, the Corsair HX1000i is also 1000 W and is documented on its own page. To lay two sets of Corsair specifications side by side, open the side-by-side comparison, or browse the full power supply category. Everything here is taken from Corsair's product page, and real-world behaviour depends on your components, your case and your ambient conditions.