Introduction & Specifications, Availability and Pricing
Over the past several years, Corsair is a name that we've grown to love for a vast number of reasons. They take great pride in their power supplies from low to high-end. Their units are always spectacular inside and out and the results that we see are some of the best in the industry. They were the first to the market with a full digital desktop power supply and since their introduction, they have been working to integrate their digital monitoring and control technology into all of their units.
Today, we have the new RMi series power supply on the bench. The RMi series is Corsair's entry-level enthusiast power supply with a focus on quality outputs and minimal noise. Our unit today is the RM750i which is the 750W model, but it is also available in 650W, 850W, and 1000W models as well. The RMi series shares several similarities with the RM series in that they are both analog units, feature 80 PLUS Gold efficiency, and run fanless up to 40% load.
The RMi series picks up a few new features though such as all Japanese capacitors, Corsair Link capabilities, and a longer warranty to name a few. Let's start tearing this apart to see what all it offers.
Specifications, Availability and Pricing
The Corsair RM750i 750W power supply features a single 12V rail that is rated for 62.5A or 750W of power. The 3.3V and 5V rails are rated for 25A each with a combined maximum output of 150W. The 5VSB rail is rate for 3A or 15W. The combined maximum output for the Corsair RM750i is 750W.
Being that this is a Corsair unit, we would expect nothing less than a complete set of features out of the RM750i. This holds even truer since it is one of their enthusiast grade units. As you can see, the RM750i doesn't miss a beat on our feature summary. It has a complete set of protections including SCP, OVP, OCP, OPP, and OTP. The unit features a fully modular cable design, all of which are either fully sleeved or of the flat ribbon type. The power supply is rated for 80 PLUS Gold efficiency and for 100% continuous output at 50C. It is nice to see the bump up here in power rating as the previous RM series units were only rated for 40C.
Corsair has an MSRP of $139.99 on the RM750i. Considering what you get with the unit, this seems like quite a bargain. There may be cheaper units of the same wattage on the market, but there will be less than a handful that provide similar features AND build quality for the same price. Corsair backs the RM750i with a seven-year warranty.
Package & Inside the Box
Corsair changed up their external packaging just a little bit with a brighter design. The front of the box gives us a good deal of information and a great shot of the unit.
The back left of the box speaks of the build and output quality of the unit, along with providing us efficiency and fan noise charts.
The other half gives us the I/O specifications of the unit, along with more images of it and dimensions.
The top of the box provides us with cable lengths and connector quantities.
Flipping the box over to the bottom, we find some information about Corsair Link and the 80 PLUS Gold efficiency.
Both sides features a bulleted list of the same features listed on the front.
Inside the Box
Inside the box, we find the same packaging that we've seen Corsair utilize for many years. The power supply is well protected by foam on all sides and the remainder of the space inside the box is taken up by the modular cables inside the bag.
The top of the unit is home to the I/O specification label and we can see the semigloss black finish clearly. In case you haven't noticed it yet, the corners on the unit are beveled and not squared off like most units.
Both sides of the unit feature the same RM750i logo with the opposite being inverted.
All of the connectors are clearly labeled on the front of the unit. The RM750i also features a fan test button in case you aren't sure if your fan is working.
The back of the unit provides ventilation via honeycomb mesh. Also present are the AC input and on/off rocker switch. Corsair also makes sure you're aware that the unit will operate fanless at lower loads.
The bottom of the unit features a wire grill for protection. Here we can also see the gray 135mm fan.
Here are all of the modular cables for the unit. All of them are either fully sleeved or of the flat ribbon type.
Included with the unit are some cable ties, mounting screws, case badge, AC input cable, warranty guide, and quite possibly the thickest PSU user manual I've ever seen.
Cabling Arrangement & A Look Inside
Corsair includes a decent selection of cables with the RM750i. There are four PCI-E cables to power a pair of GPU's. Peripheral connectors come in the form of eight SATA and two Molex, with two Molex to FDD adapters. Also included are cables for Corsair Link integration.
Rail distribution is as simple as it gets with a single 12V rail. There is no need to worry about load balancing here.
A Look Inside
Inside the unit, we find very minimal passive cooling. The unit instead relies on efficiency and the cleanliness of the design for effective air circulation to keep itself cool.
Nippon Chemi-Con caps sit on the primary side of the unit.
Nippon Chemi-Con caps take care of the remaining capacitors on the secondary side of the power supply.
Corsair uses their own NR135P 135mm fan to provide the active cooling for the RM750i.
Our load tests utilize a couple of FAST ATE active load testers, and a variety of other equipment such as an oscilloscope, power conditioner, temperature probe, and a power consumption meter. You can read more about our standard testing approach here.
The tests performed are based around six conceivable setups that are out there, and progressively load down the PSU up to the power supply's limits, or 1000W; whichever comes first. Since our test equipment's limits are higher than that of the Corsair RM750i 750W power supply, we can test it to the maximum.
The above tests represent typical loads that we have measured from various systems, and are meant to give a rough idea of where your computer might fall in line with our tests. Please keep in mind that each system is different, and actual loads can vary greatly, even with similar hardware.
Let's start by taking a look at the voltages, to see how well this unit did during testing. Starting with the 12V rail, we see 1% regulation from start to finish, with a total drop of .11V. The 5V rail managed to stay within 2% of specification, with a total drop of .07V from start to finish. Moving towards the 3.3V rail, we see that regulation was within 1% of specification, with a total voltage drop of .05V.
DC Output quality for the Corsair RM750i was exceptional, and well within specifications. During Test One, we saw 6mV of noise on our scope at 30% load. When we increased the loads in Test Three, the ripple climbed to a mere 12mV at around 75% load. Increasing loads even further showed that the noise on the 12V rail climbed to 15mV at 750W.
The Corsair RM750i 750W is rated for 80 PLUS Gold efficiency. This means that the power supply must perform at 87% / 89% / 87% efficiency, at 20% / 50% / 100% loads respectively. As you can see, the Corsair RM750i 750W performed exactly as would be expected to reach these levels of efficiency.
As I stated at the start of the review, there are many reasons that we have come to love Corsair power supplies and the RM750i that we have here today is the embodiment of all of them. The RM750i is an amazing unit and it shows just how committed Corsair is to being the best of the best. It is an industry leading unit that stands out above rest.
Looking at the unit from a performance perspective alone, it is a great unit. The voltage regulation is spot on for an enthusiast grade power supply with all rails being within 2% or less of ATX specifications. The DC Output quality of the RM750i is absolutely amazing and something that we've rarely, if ever, seen from a unit with this low of wattage or price point. The only thing that this unit doesn't exceed at is efficient. It does achieve 80 PLUS Gold and does so well, but it would be over the top if it were to have a Platinum or Titanium rating.
When you start looking at the other pieces of this unit, it just gets better. The unit looks fantastic, has great cable/connector selection, and is packed full of features. It also features the ability to be monitored digitally and controlled with the Corsair Link software. Even after several years, less than a handful of manufacturers offer this technology in their power supplies.
Once you factor in the price of the unit with a seven-year warranty, it becomes clear that this is great unit that you'll be happy to invest in.
|Quality including Design and Build||95%|
|Bundle and Packaging||93%|
|Value for Money||92%|
The Bottom Line: Great aesthetics, quiet operation, decent price, amazing performance, and an outstanding warranty all come together to make the RM750i a must have power supply.
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