Corsair AX860i, AX760i Digital ATX Power Supply Specifications & Review
This post is about the Corsair Digital ATX Power Supply, namely the AX860i and AX760i power supplies. It contains the details and technical specification as provided by Corsair, as well as a review on both of them.
The revolutionary AXi Series PSUs are the first desktop PC power supplies to use digital (DSP) control and Corsair Link to bring you an unprecedented level of monitoring and performance customization. The DSP in the AX860i makes on-the-fly adjustments for incredibly tight voltage regulation, 80 PLUS® Platinum Efficiency, and clean, stable power.
AX860i Digital ATX Power Supply — 860 Watt 80 PLUS® Platinum Certified Fully-Modular PSU Specifications
AX760i Digital ATX Power Supply — 760 Watt 80 PLUS® Platinum Certified Fully-Modular PSU Specifications
The AXi Series of power supplies have completely changed how a desktop power supply works by taking out the slower, less accurate PWM controller and supervisor IC and replaced them with a state of the art digital signal processor. The following briefly explains the technology we use, the benefits of it and how it enhances your computing experience with the Corsair Link 2 software.
Why the Corsair AX860i is the World’s Most Advanced Desktop PSU:
1.) Digitally Controlled Power
The revolutionary AX Series AX860i PSU and AX Series AX760i PSU are the first desktop PC power supply to use a Digital Signal Processor (DSP) to provide digitally-controlled power. This results in unmatched DC Voltage Output Regulation (<+/- 1.5% on the +12V rail) over a wide range of loads. This means your gaming hardware will never break a sweat, even in the most demanding situations.
2.) 80 PLUS Platinum Efficiency and Incredibly Low Noise
The state-of-the-art hybrid digital design delivers amazing efficiency (up to 92%), resulting in incredibly low heat production. This means the AX860i and AX760i can be cooled efficiently at very low fan speeds, at high wattage loads. It even operates in a silent, fanless mode up to 30% of the rated load (228W) at room temperature, which means you could even be gaming while the fan is silent!
3.) Incredibly High-Quality Power
High-quality power is much more than just high-efficiency and stable voltages. Low ripple/noise is essential to the long-term performance and reliability of your high-performance components. This is even more important if you are overclocking or running power-hungry components, such as multiple high-end GPUs. The AX860i and AX760i have an unmatched level of power quality, and exceeds the ATX Specification for ripple/noise by 3x on the +12V rail.
4.) Real-Time Monitoring and Control with Corsair Link™
Put the AX860i and AX760i under your control by connecting it directly to a USB header on your motherboard with the included cable, or to a Corsair Link Commander (available separately). Then, download the free Corsair Link Dashboard software for unrivaled power supply monitoring and control options. Corsair Link shows you how your AXi Series PSU is performing at any given moment, and lets you quickly tweak its performance. The technology is based on server-inspired diagnostic tools and allow for real-time monitoring of efficiency and power usage. And you can also configure over-current protection points and fan profiles.
Key Benefits Overview
State-of-the-art DSP-based power control technology providing outstanding DC voltage regulation, reliability and stability.
80 PLUS® Platinum Efficiency
DSP-control and Zero Voltage Switching and Zero Current Switching (ZVS / ZCS) technology results in up to 92% energy-efficiency, resulting in lower energy bills, and less heat and noise.
Ultra Low Noise Design
Thanks to their high efficiencies and low heat output the AX860i and AX760i are able to operate in a silent, fanless mode up to 30% of the rated wattage (258W), allowing for the possibility of fanless gaming. The fan speed ramps slowly above 30% load, so even fully-loaded PCs can be powered quietly.
Low Ripple and Noise: up to 3x better than the ATX Spec
Low ripple and noise equals high-quality power, allowing your performance-critical components, such as high-end graphics cards, to operate reliably for longer.
71.6 Amp Single +12V Rail
The AX860i features a massive 71.6 Amp (859.2 Watt) single +12V rail, making it the idea PSU for ultra-high end SLI and Crossfire gaming PCs based around multi-core CPUs.
Corsair LINK interface
Thanks to the DSP-based design, the AX860i can be accessed using the Corsair Link interface. This server-inspired diagnostic tool can record and monitor real-time efficiency, power usage, and adjust fan profiles. Uniquely, the AX860i can also be configured as a multi-rail device with individual PCI-E over-current protection (OCP) trip points.
Self Test Switch
The self test switch on the PSU confirms that all the DC output voltage rails are functioning correctly, and the fan is functional, providing a simple method of checking that the power supply is functioning correctly.
Fully Modular Cable System
The fully modular cable system provides total flexibility when building or upgrading your PC, since you use only the cables that you need. This reduced cable clutter also improves case airflow and cooling, and makes it much easier to build your high-end system and route cables.
As with all AX PSUs, the AX860i is built with premium components, such as high-temp 105° C capacitors, and is capable of continuous power delivery at a temperature rating of 50° C, ensuring maximum performance and reliability even in the most hot-running performance PCs.
The AX860i features a comprehensive array of protection and safety features. This includes Over-Voltage Protection (OVP), and Over-Current Protection (OCP) on the 12V, 5V, and 3.3V rails, Over-Temperature Protection (OTP), and Short-Circuit Protection (SCP).
The Corsair Advantage
Corsair Professional Series AXi PSUs are backed by a reassuring 7-year warranty and comprehensive customer support via telephone, email, forum and the Tech Support Express helpdesk.
Focus on: Digitally-Controlled Power
The Corsair AX860i uses a server-grade power train architecture and a Digital Signal Processor (DSP) to provide digitally controlled power. This state-of-the art DSP-controlled design features a proprietary control architecture to allow for dynamic, on-the-fly performance optimization.
This design delivers exceptionally stable power over the whole load range, and automatically compensates for DC output cable voltage drop. This ensures tight DC output voltage regulation without the ripple/noise and other issues associated with traditional PSU architectures.
The AX860i also incorporates digital power factor (PF). This ensures the highest possible power factor and lowest total harmonic distortion under all load conditions, via an optimized software algorithm. Also, the digital platform ensures fast real-time performance tuning and power-train optimization, resulting in a state-of-the-art power supply that is simply unmatched in the marketplace.
Focus on: Efficiency, 80 PLUS Platinum
The AX860i’s super-high efficiency is made possible due to a combination of advanced technologies and smart design features. In addition to providing superior voltage regulation, the use of a DSP also results in a reduction in the overall number of discrete components in the design, since the DSP replaces a number of discrete components. The reduced component count means fewer losses in the circuit, and increased efficiency. The reduced component count also results in improved reliability (since less can go wrong). In addition, Corsair used state-of-the-art magnetic modeling during the design phase to optimize the performance of magnetic components, also maximize efficiency.
Additionally, the AX860i utilizes Zero Voltage Switching and Zero Current Switching (ZVS / ZCS) technology, to switch at near 0V and 0A. This minimizes switching losses (the product of V x I) and increases efficiency.
Focus on: Low Noise and Fanless Operation
A major benefit to the high efficiency of the AX860i is very low heat generation, which allows the AX860i to be cooled effectively at extremely low fan noise levels. The AX860i also operates in a silent, fanless mode up to 30% of the total wattage (258W). Thanks to the highly efficient design of the latest GPUs, this provides the very real possibility of fanless operation even while gaming.
And, for PCs with higher power requirements (overclocked or with multi-GPUs) the AX860i will still be extremely quiet even at higher loads, due to the very slow ramp in fan rpm, and also the use of a high-quality, quiet 120mm fan.
Focus on: High-quality Power – exceeding the ATX Spec
Providing high-quality power is more than just stable voltages and high-efficiency – in fact, high-efficiency alone is not a reliable measure of quality. Low ripple and noise allows your other performance-critical components, such as graphics cards, to operate reliably for longer.
In addition to the DSP-control, the AX860i features individual DC-DC regulation for 3.3V, 5V and 12V rails, and secondary side synchronous rectification, utilizing MOSFETs that have lower losses than the conventional output rectification schemes. An advanced 4-layer modular connector board PCB ensures a better ground return plane, lower resistance and low voltage drops. This, combined with circuit trace optimization, also helps to minimize ripple and noise.
The AX860i is designed to exceed the ATX specification for ripple and noise, and voltage regulation. For example, the ripple/noise on the critical +12V is rated to be less than 40mV, which is 3x better than the maximum allowed by the ATX Specification.
Focus on: Corsair Link
The hybrid digital design of the AX860i allows for a full suite of telemetry to be communicated from the AX860i to the PC over a Corsair Link interface to the included USB dongle, or Corsair Link Commander Unit (sold separately). Using the free Corsair Link Dashboard software, you can then monitor a huge range of performance variables, including power input and output, efficiency, fan speed, and internal temperature. You can also configure and customize some features, including selecting fan speed modes, and even select between single rail or multi-rail modes, with selectable OCP trip points. This allows you to, for example, configure each PCI-E graphics connector separately, providing a higher maximum amount of current to a high-end GPU in a multi-GPU setup.
760W Professional Series AXi specifications
Modern CPUs and graphics cards all require power to be supplied over the +12V rail. The 760W Professional Series AXi PSU features a huge 63.3 Amp (859.2 Watt) single +12V rail, which makes it ideal for high-end gaming PCs with single and multiple GPUs. Uniquely, it can also be configured as a multi-rail device with individual PCI-E over-current protection (OCP) trip points, providing an unmatched level of flexibility and control.
|Corsair 860W AXi Power Supply|
|Max Combined Wattage||125W||859.2W||9.6W||15W|
|860 Watts @ 50°C ambient temperature|
By utilizing a digital signal processor, Corsair has provided some of the best voltage regulation, reduced ripple and the highest efficiency available in a desktop power supply today. Add to this a cooling fan with a zero RPM mode for absolutely silent operation under typical computing tasks and a fully modular cable interface, and the AXi is the best PSU on the market!
Data sources: http://www.corsair.com/en/power-supply-units/ax-series-power-supply-units/ax860i-digital-atx-power-supply-860-watt-80-plus-platinum-certified-fully-modular-psu.html, http://www.corsair.com/en/power-supply-units/ax-series-power-supply-units/ax760i-digital-atx-power-supply-760-watt-80-plus-platinum-certified-fully-modular-psu.html, http://www.corsair.com/en/blog/ax860i_technical_details/ (accessed on Dec 20,2012)