Besides the low-efficiency requirements

From the CPU up to your precious graphics card, everything in your PC benefits from the best power supply you can buy, so you should pay extra attention when the time comes to select your next PSU. 

Another essential detail on PSUs is that the good ones last for several systems builds. So, if you make a good investment, you won’t have to spend extra money the next time you perform a hardware upgrade. The way new processors and graphics cards are v buck generator chewing through more power with each generation, that’s a legitimate concern. This means that you should plan to buy a good and reliable PSU and a strong enough unit to cover any possible upgrades with enough connectors. 

A few years ago, high-capacity PSUs weren’t so efficient at light and moderate loads when compared to lower-capacity ones, at least. This is not the case anymore, so if you select a modern Gold or higher efficiency PSU, you won’t have low efficiency at light loads, regardless of its capacity. 

Intel, in its newest ATX spec (v2.53), has set some low-load efficiency requirements, which state that every PSU should have more than 70% efficiency with 10W (<500W capacity) or 2% of its max-rated-capacity loads. This requirement is effective from July 2020, so every power supply meeting the ATX12V v2.53 spec has to be efficient at lighter loads, too. 

Besides the low-efficiency requirements, Intel has also included some new PSU timing requirements in its latest specification, addressing the Alternative Sleep Mode (ASM), which allows for the system’s ultra-fast wake from sleep mode. Microsoft’s Modern Standby is an ASM example. Although there are no ASM compatible mainboards when writing these lines, PSUs last for many system builds, but it is always worth being future-proofed.

The best power supply for PC gaming

Corsair RM750x power supply
(Image credit: Corsair)

1. Corsair RM750x (2021)

The best power supply for high-end graphics cards

Manufacturer (OEM): CWT | Max. DC output: 750W | Efficiency: 80 PLUS Gold | Form factor: ATX12V v2.4, EPS 2.92 | Noise: Cybenetics A- (25-30 dBA) | Cooling: 140mm Mag Lev fan (NR140ML) | Modularity: Fully modular | EPS connectors: 2 | PCIe connectors: 4 (on two cables) | Warranty: 10 years High overall performance Magnetic Levitation fan Fully modular Ten-year warranty High OCP triggering points on the minor rails  Fan speed profile could be more relaxed  In cable capacitors 

The time has come for Corsair to make some changes to its popular RMx line of power supplies since the competition has gotten far tougher in this market segment from the likes of Seasonic Focus GX, XPG Core Reactor, Super Flower Leadex V, etc. 

Indeed the task’s not easy since the existing RMx units only counted three years in production and delivered excellent performance along with dead silent operation. In most cases, when you try to improve something already good, many things can wrong, but thankfully, this wasn’t the case for the new Corsair RMx range. 

The new Corsair RMx (2021) line consists of five models with capacities ranging from 550W to 1000W, and the main differences with the previous models are: 

  • Magnetic levitation fan for an increased lifetime under high operating temperatures
  • Modern standby compatibility for fast wake from sleep times
  • High efficiency under light and very light loads
  • Three EPS connectors with 1000W and 850W PSUs
  • 80 PLUS Gold certifications

The new RM750x has a significant performance lead over its predecessor, although it loses average noise output to the older model’s dead silent operation. Still, you cannot call the new model noisy because it achieves a Cybenetics A- rating, with its average noise output being close to 28 dBA. 

The only section that needs a slight improvement is the efficiency under high loads, which is the main reason for the not-so-competitive average efficiency. Nonetheless, the efficiency under light loads is sky-high. 

Finally, the fan upgrade is a highly welcome feature. It boosts reliability, even under harsh conditions where most rifle and fluid dynamic bearing fans would have issues in the long run. With two EPS and four PCIe connectors in two cables, this PSU will be able to handle a powerful gaming system with enough oomph to cope with a GeForce RTX 3080

Seasonic Prime Titanium TX-1000 power supply

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