The best power supply is probably not going to be the first component you excitedly pick for your new gaming PC build project, but it could be one of the most important. The power supply is the heart of your PC; it feeds every component you have in your machine, and if your PSU goes down, it can take everything else with it.
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.
It’s worth remembering that a good PSU will last for several systems builds. So, make a good investment now and you won’t have to spend extra money the next time you upgrade. The way new processors and graphics cards are chewing through more power with each generation, that’s a legitimate concern.
A few years ago, high-capacity PSUs were less 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 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:
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 area 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 hit the jackpot with its Prime platform, which starts from Gold efficiency and goes all the way up to Titanium. Several high-impact brands have already used Seasonic’s base platform in their own PSUs, including Asus with its ROG Thor 1200W, Corsair’s AX line, and Antec with its legendary Signature line.
If Seasonic could make more of these units, I would expect more brands to get in line to source them, despite their high prices. The majority of buyers prefer low-efficiency and more affordable power supplies, unfortunately. Still, when an OEM is confident enough to provide a platform with a twelve-year warranty, you know that this is a bullet-proof product.
The Seasonic TX-1000 is a great power supply featuring top-notch build quality. Besides great soldering work, it also uses Japanese capacitors everywhere, including many polymer caps besides electrolytic ones and a fluid dynamic bearing fan.