Given the many options available, selecting the right power supply unit (PSU) for your needs can be daunting. Each PSU has distinct features that make it stand out, making comparisons challenging. To ensure you get the most value for your money, conducting thorough research before purchasing is crucial.

This article compares Corsair RM and RMX to help you choose the best PSU for your needs. Read on to discover the better choice between the two models.

Difference Between Corsair RM And RMX

There are a few key differences between the Corsair RM and RMX.

The following are the major ones:

1. Connectors

The Corsair RM has fewer connectors than the RMX. This is because the RM is a semi-modular power supply, while the RMX is fully modular. This means that the RM has some connectors permanently attached to the PSU, while the RMX does not have any permanently attached connectors.

This is a benefit of the RMX as it allows you only to use the cables you need, which can help improve airflow and reduce clutter.

2. Efficiency

The Corsair RM is a bit more efficient than the RMX. The RM is rated for 80 PLUS Gold efficiency, while the RMX is rated for 80 PLUS Bronze efficiency. This means that the RM can convert more of the AC power coming into DC power that your components can use.

This results in less wasted power and lowers electricity bills.

3. Fan

The Corsair RM has a 120mm fan, while the RMX has a 140mm fan. The larger fan on the RMX helps improve airflow and keeps the PSU cooler. This is especially important if you plan on overclocking your components, as they will generate more heat.

4. Price

The Corsair RM is the cheaper option of the two. This is because it is a semi-modular PSU, while the RMX is a fully modular PSU. The RM is better if you do not need the extra flexibility that a fully modular PSU offers.

5. Warranty

The Corsair RM comes with a 3-year warranty, while the RMX comes with a 5-year warranty. This significant difference shows that Corsair has more confidence in the RMX.

6. Wattage

The Corsair RM is available in 550W, 650W, and 750W versions. The RMX is only available in 750W and 850W versions. This means the RMX can power more components and is better suited for gaming PCs and high-end systems.

Things To Consider When Choosing a Power Supply

When buying for your power needs, whether for a new build or an upgrade, there are some things that you need to keep in mind.

The following are just some of the things that you should take into consideration when choosing a power supply:

1. Wattage Output

This is probably the most important factor when choosing a power supply. The wattage output will determine how much power your system can draw from the power supply. You will need a power supply with a higher wattage output if you have a system with many high-powered components.

2. Power Supply Efficiency

It would be best if you considered the efficiency of the power supply. The higher the efficiency, the less power will be wasted as heat. This is important because it can help prolong the life of your components and save you money on your electricity bill.

3. Fan Technology

The type of fan used in a power supply can affect overall performance and noise output. The Corsair RM and RMX use 120mm fans with fluid dynamic bearings. These are the quietest and most reliable types of fans.

When you are looking at power supplies, make sure to check what type of fan is used. It should be one of your top priorities.

4. Modularity

Modularity is a feature that allows you to connect only the cables that you need to your power supply. This can help improve airflow and reduce clutter in your case. The Corsair RM and RMX are both fully modular power supplies. You should consider modularity if you are looking for a cleaner build.

5. Power Supply Capacitors

The capacitors in a power supply filter out the AC ripple on the DC output. The higher quality of the capacitors, the better the DC output will be. The best power supplies use Japanese capacitors, known for their high quality.

6. Protection Functions

Power supplies come with various protection functions that help keep your components safe. The most important is over-voltage protection, which shuts off the power supply if the DC output voltage gets too high.

Other protection functions include over-current protection, short-circuit protection and over-temperature protection.

The following are the lists of power protection:

  • Over Current Protection: It should shut down the power in case of overcurrent.
  • Under Voltage Protection: It should turn off the power in case of low voltage.
  • Over Temperature Protection: Should turn off the power in case of temperature.
  • Surge Protection: This should protect your devices against sudden power surges.
  • Brown Out Protection: You should protect your devices against brownouts.
  • Over Power Protection: Should turn off the power if it exceeds the maximum power rating.
  • Short Circuit Protection: Should turn off the power in case of a short circuit.

7. Warranty and Price

The warranty is an important factor to consider when choosing a power supply. The longer the warranty, the more confidence you can have in the quality of the product. The price is also an important consideration. In general, the higher the price, the better the quality of the power supply.

However, there are some great power supplies available at mid-range prices.

8. Power Supply Capacitors

A power supply needs to have good capacitors. Capacitors store energy and smooth out voltage fluctuations. Many poor-quality power supplies use lower-quality capacitors, which can cause all sorts of problems, including power supply failure.

Check what kind of capacitors are used in a power supply before you buy it.

Corsair RM vs RMX: Which Should You Buy?

Corsair RM and RMX power supplies are both high-quality products that offer reliable power delivery and excellent efficiency. If you are wondering which one is best for your needs, here is a brief overview of each option to help you decide.

The Corsair RM is a great choice for those who need a reliable and powerful power supply for their gaming PC. It delivers clean and stable power delivery, and its modular design makes it easy to install. The RM is also very efficient, and its 120mm fan keeps it cool even under heavy loads.

The RMX is a great choice for those who want the best possible performance from their power supply. It delivers extremely clean and stable power delivery, and its modular design makes it easy to install. The RMX is also very efficient, and its 140mm fan keeps it cool even when under heavy load.

The Corsair RM and RMX are great choices for a power supply, but the RMX is better for those who want the best possible performance.

Frequently Asked Questions

Are RM and RMx Cables Compatible?

No, RM and RMx cables are not compatible. This incompatibility is because RMx cables use a different type of connector than RM cables. The two types of connectors are incompatible, so you cannot use an RMx cable with an RM device or vice versa.

If you need to connect an RM device to an RMx cable, you will need to use an adapter.

Can I Use an RM Cable with an RMx Device?

No, the cable types are not compatible with each other. The RM uses a standard 24-pin connector, while the RMx uses a proprietary 8-pin connector. You can use an RMx cable with an RM device, but you will not be able to achieve the full performance of the RMx.

Are PSU Cables Interchangeable?

Corsair RM and RMX models are fully modular power supplies. This means all cables detach from the PSU, so you can remove any cables you don’t need and replace them with others that better suit your needs. This also means that the cables are all interchangeable.

So, if you need a longer or shorter cable or a different connector, you can just swap out the old one for a new one.

Are RMx Power Supplies Good?

The Corsair RMx line is a great choice for power supplies, offering good quality units at a reasonable price. The RMx series is fully modular, meaning that all cables can be removed if not needed, which helps keep things tidy and improve airflow inside your case.

The RMx line is also 80 Plus Gold certified, meaning it is at least 87% efficient under real-world conditions. Overall, the Corsair RMx line is a great choice for power supplies, offering good quality units at a reasonable price.

Are Corsair Power Supplies Good?

Corsair power supplies are some of the most popular on the market and for a good reason. They offer great value for money, are highly reliable, and come with various features that make them ideal for a wide range of applications.

How Long Do Corsair Power Supplies Last?

Corsair power supplies are among the most reliable and longest-lasting on the market. Many users never have to replace their Corsair power supply after several years of use. If you need to replace your power supply, Corsair offers a wide variety of options so that you can find the perfect one for your needs.

No matter which Corsair power supply you choose, you can be confident that it will provide reliable, long-lasting power for your PC.

How Much Energy Does A 750-Watt Power Supply Use?

A 750-watt power supply uses about 750 watts of energy. This is about the same amount of energy as a 100-watt light bulb. A power supply uses more energy when it is first turned on and then uses less energy as it continues to run.

A 750-watt power supply can provide enough power for a high-end gaming PC. Depending on the graphics card and other components, a high-end gaming PC may require more than 750 watts of power. If you are unsure how much power your PC needs, use an online power supply calculator.

How Much Power Does an RMx Use?

Assuming that all models in the RMx series are equally efficient, RMx will use approximately 120W of power. The actual power consumption will depend on the specific model and the environmental conditions.

What is the Difference Between an RM and an RMx?

The Corsair RMx is an upgraded version of the Corsair RM. The main difference is that the RMx has a higher wattage capacity. The RMx can handle up to 750 watts, while the RM can only handle 550 watts.

The RMx also has a higher amp rating, meaning it can provide more power to your devices.

Can I Use an RMx with an RM?

No, the RMx is not compatible with the RM. The RMx is a newer power supply and uses different cables. The two are not interchangeable.

How Do I Know If My Power Supply Is Compatible With My Graphics Card?

You can check the compatibility of your power supply and graphics card by looking at the specifications of each device. The product documentation will list the minimum power requirement for your graphics card. For example, the NVIDIA GeForce GTX 1080 requires a minimum of 500 Watts.

To be safe, we recommend adding 50-75 Watts to account for any power fluctuations.

Corsair RMx power supplies are compatible with a variety of different graphics cards. Some popular options include the Nvidia RTX 3080, AMD Radeon RX 580, and the NVIDIA GeForce GTX 1070.


Choosing the best PSU for your needs can be hard, but generally, the Corsair RM and RMX series are both great choices. The RMX is the way to go if you need a PSU with higher wattage. However, the RM is a great option if you don’t need as much power or want to save a few bucks.

Whichever you choose, you can’t go wrong with a Corsair PSU.

Tim Miller

Tim has always been obsessed with computers his whole life. After working for 25 years in the computer and electronics field, he now enjoys writing about computers to help others. Most of his time is spent in front of his computer or other technology to continue to learn more. He likes to try new things and keep up with the latest industry trends so he can share them with others.

Leave a Comment