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Aerocool Project 7 850W PSU Review

Final Analysis

Aerocool decided to enter the high-end PSU market with its Project 7 models, of which there are currently three. Capacities range from 650W to 850W, hitting some of the most popular output levels for enthusiast-oriented builds. Unfortunately for our U.S. audience, none of these power supplies are available for purchase yet, and we don't yet know when they'll arrive.

Hopefully distributors at least consider carrying them, though. Their performance is excellent and Aerocool covers them with seven-year warranty coverage. The company does need to adjust its pricing in order to compete with well-established incumbents. But if it can do this, we think it'll successfully infiltrate one of the most challenging markets in the world. We are always excited to see more companies driving innovation and keeping the big names on their toes, after all.

Again, the ACP-850FP7 features solid performance that includes tight load regulation, good ripple suppression, and high efficiency. Its transient response could use some improvement, but it's decent overall. In order to improve a PSU's transient response, you usually have to sacrifice a bit of ripple performance. And since the ACP-850FP7 achieves close to 1% deviations at +12V (the most important rail of all), we suspect that Andyson didn't want to lose any time by tuning it lower while trying to keep ripple suppression at the same levels.

Speaking of ripple, we like that this unit demonstrates impressive results without leaning on special cables with extra capacitors in them. As a result, system builders can enjoy less rigidity from the easy-to-route flat cables. Modders should be happy as well; Aerocool's cables are also easier to customize.

Besides its high efficiency, another of the ACP-850FP7's advantages is quiet operation. This is achieved with a low-speed fan, the implementation of a semi-passive mode, and a conservative fan profile. Even at challenging ambient temperatures, the fan isn't pushed too hard. Aerocool and Andyson tried to make this PSU as quiet as possible, and their efforts are clearly depicted in our results. Currently, only Corsair sells similarly efficient power supplies that offer the same low noise output. All of the other brands trail behind. So, if you need one of the quietest 850W PSUs that money can buy, keep an eye out for the arrival of Aerocool's ACP-850FP7 or grab one of the Corsair models already available.

In the next revision of the Project 7 PSUs, we would like to see Aerocool add a switch to turn its semi-passive mode on or off. As the ACP-850FP7 stands now its fan profile is so loose and its fan is so quiet at low speeds that we'd like to keep it running all of the time to push operating temperatures down even more. Surely, this would help extend the power supply's lifetime.


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  • drvdsobhari
    prices must be indicate in Indian currency also
    Reply
  • Aris_Mp
    you can easily convert them through google or a currency-related site.
    Reply
  • vgray35
    And lo and behold another elephant enters the room, except here we have a touch of pesky arrogance thrown into the mix, where $165 admits a product without fan failure and 12V over current protection. But that is really not the least of the woes. It is high time Tom's Hardware calls out these manufacturers for producing inefficient power supplies, and stop this nonsense of labeling as high efficiency a peak of 92% (88% at full load), and certainly fanless mode is not difficult to achieve and should be part of all PS and hardly rises to the level of a unique feature. If these features are missing then the PS is not qualified for the use in computers – period. Let us not accept mediocrity as acceptable, and it is high time PS become true commodity level components. Fundamental Power Supply improvements look for increased efficiency and reduced cost through improved Power Electronics Topologies, and the fact of the matter is modern power supplies are grossly inefficient, and are largely founded upon old Buck converter technology and its derivatives (forward, bridge, etc), including the resonant variants like the LLC resonant converter based on half/full bridge drivers. Despite great strides made over 60y these variants still belong to the same family of topologies, insisting on inserting an air gap into an AC-inductor to a convert it to a DC-inductor so it passes a large DC current, and hard switching of large currents. Even the various resonant and zero current switching variants have not delivered on ultra high efficiency, or high performance step response settling times. These are not bold claims as I will attempt to describe below, and the common element in these topologies limiting performance is largely inductive energy storage – the infamous ferrite cored inductor (i.e. transformers with air-gaps are not true transformers, but energy storage devices). What we have is 850W accompanied by 120W of waste heat at full load (~88% eff.) and 32W waste heat at 50% load (~92.5% eff.), when 98% eff. could yield 17W of waste heat at full load. So why are manufacturers asleep at the switch? What about an ATX PS with a length of 50mm instead of 160mm @ 650W where temperature never exceeds 20 deg above ambient at full load, with motherboard VRM sporting 99% eff. and 3 GPUs with VRMs at 99% efficiency? This is not pie in sky rhetoric here as shown below, and power supplies could come to < $40 sporting ultra high efficiency for 1kW units.
    The Buck converter was invented during the 1950's and improvement in high frequency switching devices has largely hidden the failings of this topology, including its various variants, and despite improvements a lot of waste heat still accompanies the power conversion process. Looking at the limiting factors in this process reveals without exception modern topologies use the air-gapped inductor for energy storage and power transfer, which is the root cause of bad efficiency, large size and poor energy transfer capability. The hope of multi-Mega Hertz switching to reduce size has been proven futile, as this brings with it reduced operating core flux density at elevated frequencies, increased core losses and switching losses, which offset much of the championed size reductions. Several problems underpin inductive energy storage topologies, in that currents are hard switched causing EMI noise that must be filtered out, and resonant topologies that reduce switching losses have not alleviated the underlying issue of inefficient inductive energy storage, such as for example the LLC resonant converter. There is much more that could be said on this topic, but suffice it to say 90% efficiency is the norm here, with slightly better efficiency obtained only at the price of increased size. But yet new topologies are now available that will allow the Buck converter and its derivatives to be retired - new topologies that have already been invented over the course of the last decade. Several new elements have emerged that now offer efficiencies in the 98% to 99.5% range which reduces waste heat by over 80%. Why then are we still plagued by the poor performance that derives from inductive energy storage?
    First and foremost capacitive energy storage is by far more compact by 2 orders of magnitude, and coupled with a new PWM-resonant switching topology that allows single cycle response settling times, and zero current switching, increases dramatically efficiency and overall performance with >70% reduction in size. An inductor and capacitor resonant network is still in play here, but also introduces a new hybrid resonant switching and resonance scaling, which allows resonant capacitance to be increased by 2 orders of magnitude, with a corresponding reduction in the size of the inductor component, and what's more this is now achievable at 50kHz frequency instead of MHz frequencies; which saves considerably on switching losses which still maintaining minuscule size. Power supply size reduction approaches >70% in eliminating ferrite cores, and >80% in large heat sinks with the advent of ultra efficiency, with a corresponding cost reduction. For example the inductor has no ferrite core (i.e. air-cored) and becomes a 5 mm length of copper wire, while a bank of ceramic chip capacitors in parallel are minuscule compared to today’s air-gapped DC-inductors. These new technologies also offer reduced operating flux densities for high frequency isolation transformers, which operate purely as AC transformers with no need for air-gaps to pass DC current. Here is a link to an article describing some of these new elements.
    Ultra high 99.5% peak efficiency
    http://www.powerelectronics.com/power-management/step-down-dc-dc-converter-eliminates-ferrite-cores-50khz-enabling-power-supply-chip
    See section on: 98% Efficient Single-Stage AC/DC Converter Topologies
    http://www.power-mag.com/pdf/issuearchive/46.pdf

    An ATX PSU at 98% efficiency with a single stage PFC and DC-DC converter, generating much less EMI noise than today’s PSU is achievable. A motherboard VRM at 99% efficiency using a single stage for each of the CPU, GPU, and memory components, with response settling times an order of magnitude faster than the multi-stage buck converters, is achievable. The GPU using a similar VRM, net waste heat within a computer case is reduced by over 80%. Platinum and Titanium power supplies do not provide ultra high efficiency >98% and are monstrosities in terms of size. The ability to eliminate ferrite cores even at 50kHz is a panacea of Power Electronics Converters. An 850W PS driving a system with 3 GPU could be reduced to 600W, with 3*25W less GPU waste heat, 70W less ATX PS heat, 60W less motherboard VRM waste heat – a total of 200W of waste heat saved at full load. There is really no reason why memory modules could not incorporate their own VRM on each memory module, so small is this new switching topology. The entire VRM is now just a single chip incorporating controller and power stage.
    The PS efficiency standards are way out of date, and manufacturers are not sufficiently diligent about advancing the art, and so surely we should object when they present us with these high priced monstrosities. On does not need better standards to adopt improved power electronics topologies.

    Sorry for such a long post, but somebody had to speak up on this issue.
    Reply