We have come to love Corsair over the past few years for a plethora of different reasons. They are very proud of their power supply, which ranges from basic to high-end. Their products are consistently stunning both inside and out, and the outcomes we observe are some of the best in the business. They introduced the first fully digital desktop power supply to the market, and ever since then, they have been working to incorporate digital monitoring and control technology into each and every one of their products.
For the vast majority of single-GPU systems today, 750W is overkill. However, those with higher-end components who also want to experiment with overclocking will likely be looking in this range. Even for less demanding systems, it can be advantageous to go a little overboard because it will lower operating noise and keep your PSU operating at close to maximum efficiency.
The current RM Series from Corsair comprises three models with 850W, 750W, and 650W of power. In this review, we’ll examine the CORSAIR RM750 Power Supply in great detail. The RM Series power supplies are created by Corsair and manufactured by Channel Well Technologies, just as many earlier iterations (CWT).
All RM Series power supplies come with fully modular cables and are designed to operate quietly. They have a huge 135mm cooling fan that is built to produce minimal noise and high static pressure, as well as Zero RPM Fan Mode. These PSUs will provide clean, reliable, uninterrupted power, according to Corsair, even at temperatures up to 50°C. And a 10-year warranty is included with the RM series.
The CORSAIR RM750 Power Supply employs Chinese Elite caps and a Hong Hua rifle bearing fan, although it has 100W less power than its bigger brother. Japanese caps and the premium NR135L fan are included with the somewhat more costly RM750x. Despite the fact that these changes are significant, both models’ offered warranties are the same, at 10 years.
Specification and part analysis of CORSAIR RM750 Power Supply
The CORSAIR RM750 Power Supply was delivered safely packaged inside a common retail box that highlighted the product’s features and technical details. The power supply is encased in plastic and protected by foam inserts (no fancy black velvet bag for the RM series).
The box also includes ten modular cables, a power cord, mounting screws, a leaflet with instructions, cable ties, and a logo for the Corsair case.
The 160mm (6.3″) long CORSAIR RM750 Power Supply enclosure is matte black with light gray writing. For a distinctive look, take note of the beveled edges. An AC receptacle and On/Off switch are located on the back panel.
To make sure you realize that the fan won’t start spinning until the PSU is under moderate load, the PSU ships with a label covering the back panel.
Twelve modular connectors for the power cables are included on the front panel, all of which are carefully keyed and labeled. A Hong Hua 135mm fan (HA1425M12F-Z) that runs in near-silent Zero RPM Fan Mode up to mid-power loads is used by the power supply. The fan is rated for 0.36A at 12 VDC and has a rifle bearing for quiet operation.
A good selection of fully modular cables and connectors are included with the RM750. With the exception of the 24-pin ATX cable, all of the cables are black, flat ribbon styles, which facilitate quick installation, have a neat appearance, and improve case ventilation.
With an LLC resonant converter, the Corsair RM Series PSUs use a cutting-edge half-bridge design to reduce switching losses and boost efficiency. Synchronous rectification is used in the secondary to create the +3.3V and +5V minor rails from the +12V main section using two DC-to-DC VRMs.
The CORSAIR RM750 Power Supply uses electrolytic capacitors with a maximum operating temperature of 105°C. For instance, the two bulk capacitors are two Su’scon products with 330uF, 400V, and 105°C ratings. The soldering seems fine, but the overall component layout is a touch cluttered but tidy.
It makes sense for the capacity to combine 10 SATA connections, four Molex, and six 6+2-pin PCIe connectors, and having dual 4+4-pin EPS/ATX12V connectors guarantees compatibility with contemporary motherboards that are starting to offer them more frequently (especially the X570). For individuals whose PCs are overloaded with drives and accessories, the increase in concurrently usable ports from nine to twelve is welcome news.
|Continuous output rated temperature||50°C|
|Continuous power W||750W|
|Fan bearing technology||Rifle Bearing|
|Fan size mm||135mm|
|MTBF hours||100,000 Hours|
|Multi – Gpu ready||Yes|
|80 PLUS Efficiency||Gold|
|PSU Form Factor||ATX|
|Zero RPM Mode||Yes|
|Cable Type||Low-Profile, All Black|
A Range of Temperatures and Noise Levels
A passive air duct allows warm exhaust air from the PSU under test to be cycled back to the intake, simulating a demanding situation by allowing the PSU air inlet temperature to rise up to 40°C when under load.
By deducting the internal case air temperature (T in) from the temperature of the warm exhaust air coming out the back of the power supply, the difference in temperature across the power supply was computed (T out).
At the air input and exhaust exit, thermocouples were installed. During testing, the room’s temperature was 23oC (74oF) +/- 0.5oC.
Readings of the sound pressure level were taken in a silent room at a distance of 3′ from the back of the case. 27 dBA was the ambient noise level.
Surprisingly, the cooling fan gradually turned on and kept running during the initial low and mid power testing. The power supply didn’t quit whirling until it was put under a lot of strain and then lessened, nevertheless. The cooling fan restarted after the power supply was loaded for testing, but it was still very silent. At full load, both the noise level and fan speed rose.
FINAL CONCLUSIONS AND THOUGHTS
Even under full load, the Corsair RM750 power supply displayed superb AC ripple suppression and very good voltage regulation. The power supply produces good efficiency and has a very wide selection of all modular cables, easily meeting the requirements for 80 Plus Gold. The big cooling fan that uses a rifle bearing allows the RM750 PSU to run quietly under mid-power loads and has a Zero RPM fan mode. The PSU includes a complete set of safety circuits and is covered by a 10-year warranty from Corsair.
Is Corsair RM750 Power Supply enough for Ryzen CPU?
Depending on many factors, a 750W power supply may be sufficient for the Ryzen CPU, because the system is made up of many different components that work together and all consume some power. So, depending on the rest of the system, 750W may be sufficient for a decent gaming build. Depending on the Ryzen CPU, for example, Ryzen 3 consumes only 65W, whereas other Ryzen factory CPUs such as Ryzen 7 or Threadripper workstation CPUs can consume more than 200W.
The Corsair RM750 is the middle member of the new RM line, offering excellent overall performance as well as quiet operation. It has a street price of $119.99 (£94.2), which is quite high when compared to the RM750x, which has better filtering capacitors and a higher quality fan for only a few dollars/pounds more.
For example Corsair RM750 Power Supply is enough for RTX 3070 and Ryzen 5 5600X.
The GPU and CPU consume the majority of system power when you game or perform other tasks that require hardware performance, such as productivity or video editing rendering. In idle mode, your computer uses very little power.
Your CPU has a TDP of 65W, and Nvidia’s RTX 3070 PSU requirements are 650W. You are using or own 750W, which is 100W more than the recommended PSU. So it will work just fine, even if you are overcooking to some extent. Your CPU is overly efficient, allowing the GPU to draw power from the CPU without much interruption.
Is Corsair RM750 Power Supply enough for an Intel CPU?
(Not the best on the market, but epic for a compact ITX with regular water cooling)
So, if you choose your power supply wisely, Corsair RM750 Power Supply is enough for a 12700KF 3080 rig for example.
A lot of those good PSUs have a lot of redundant capacity (15% or more) to both increase power supply stability and lower the operating temperature to lower the operating noise caused by fan and capacitor, which means you can choose to push it further than nominal capacity all the way to the edge for extreme performance, or to use it safely within the nominal capacity.
Meanwhile, the more mundane ones are primarily intended for nominal capacity and minimal redundancy.
What about the bad ones? I guess I’ll leave it to you to imagine it.
The best way to choose a good PSU is to look beyond the 80Plus mark or the brand of the PSU (some models from well-known brands and some Gold 80Plus certified PSUs are also bad), but to ensure that the PSU model is widely acclaimed.
There are also online tests that determine the actual capacity of power supplies; make sure to look into them before making a purchase.
Also, as I previously stated, you would need to use a tdp calculator, which you can find on Google, and then calculate the total wattage used by your system. Then you can see if the Corsair RM 750 is up to the task, but for most gaming builds that don’t require excessive overclocking, it will suffice.
Can you do overclocking with Corsair RM750 Power Supply?
The RTX 3090 can be powered by a 750W power supply… If you’re trying to overclock an Intel i9 12900k. (Stock draws 230W and OC draws 350W.) With just the CPU, crazy OC would be around 400W.
290W standard power draw from an RTX 3070 Ti, on the other hand.
So 640W 670W PSU is about the bare minimum for an i9-12900k build. For a good build, we typically recommend 1.25-1.5 times the draw. So 850W-1000W is the recommended power range for that build.
However, something less powerful, such as a Ryzen 5 5600x or an i5 11400k, has a maximum power draw of 90 watts. So 90+290+30 for the remainder of the system. 620W would be sufficient for that build.
To be honest, you could go all the way up to a Ryzen 9 5950x because it only needs around 180W and does not require an 800W PSU.
So we can say that the Corsair RM750 Power Supply is powerful enough for some overclocking, but we would recommend at least 800 – 1000W for serious CPU overclocking, because you want stability and not worrying about frying your computer.
Corsair RM750 Power Supply rating
At 50°C operating temperature, Corsair RM750 Power Supply is rated for a combined, continuous output power of up to 750 watts. The power supply includes a single +12V rail that can deliver up to 62.5A (750W) on the +12V outputs. The power supply unit has a universal AC line input (which automatically adjusts the AC line voltage) and active PFC, making it more environmentally friendly to the local power grid.
What connectors are on CORSAIR RM750 Power Supply?
All RM Series power supplies feature fully modular cables and are designed for quiet operation. They have a Zero RPM Fan Mode and a large 135mm cooling fan that is designed to produce low noise and high static pressure. Corsair guarantees that these power supplies will provide clean, stable, continuous power at temperatures up to 50°C. The RM series also comes with a 10-year warranty. At 50°C, the Corsair RM750 power supply has a combined, continuous output power of up to 750 watts. The power supply includes a single +12V rail capable of delivering up to 62.5A (750W) on the +12V outputs. The power supply unit has a universal AC line input (which automatically adjusts the AC line voltage) and an active PFC, making it more environmentally friendly to the local power grid.
The Corsair RM750 power supply arrived safely packaged inside a standard retail box that displayed the unit’s features and specifications. The power supply is wrapped in plastic and protected by foam inserts (no fancy black velvet bag for the RM series). The box also includes a power cord, mounting screws, an information pamphlet, cable ties, a Corsair case badge, and ten modular cables in addition to the power supply.
The Corsair RM750 power supply enclosure is 160mm (6.3″) long and matte black with light gray lettering. Take note of the beveled edges for a distinct appearance. An On/Off switch and an AC receptacle are located on the back panel.
The PSU comes with a label on the back panel informing you that the fan will not start spinning until the PSU is under moderate load.
The front panel features twelve modular connectors for power cables that are all nicely keyed and labeled. The power supply employs a 135mm Hong Hua fan (HA1425M12F-Z) that runs in near-silent Zero RPM Fan Mode up to mid-power loads. The fan operates quietly thanks to a rifle bearing and is rated for 0.36A at 12 VDC.
The RM750 includes a good selection of fully modular cables and connectors. Except for the 24-pin ATX cable, which is sleeved, all of the cables are black, flat ribbon-style, which makes for easy installation, a clean look, and helps optimize case airflow.
CORSAIR RM750 Power Supply connectors are:
On the front panel, there are twelve modular connectors for power cables, all of which are carefully keyed and labeled. The power supply employs a Hong Hua 135mm fan (HA1425M12F-Z) that operates in near-silent Zero RPM Fan Mode up to mid-power loads. The fan has a rifle bearing for quiet operation and is rated for 0.36A at 12 VDC.
The RM750 comes with a good selection of fully modular cables and connectors. All of the cables, with the exception of the 24-pin ATX cable, are black, flat ribbon styles that facilitate quick installation, have a neat appearance, and improve case ventilation.
It makes sense to be able to combine 10 SATA connections, four Molex, and six 6+2-pin PCIe connectors, and having dual 4+4-pin EPS/ATX12V connectors ensures compatibility with modern motherboards, which are becoming more common (especially the X570). Individuals whose PCs are overburdened with drives and accessories will appreciate the increase in concurrently usable ports from nine to twelve.
CORSAIR RM750 Power Supply