Today, Corsair is releasing two new models within its AX “i” power supply series, the AX760i and the AX860i. These power supplies and the AX1200i have an internal digital signal processor, which allows never before seen voltage regulation and noise and ripple levels. In addition, you can monitor all of the parameters of the power supply on your computer through a USB-based connection called Corsair Link. Let’s take an in-depth look at the AX760i, which also comes with a fully modular cabling system and the 80 Plus Platinum certification.
The AX “i” power supplies are targeted to the ultimate enthusiast, who understands the advantages of having a technically flawless power supply. Two of the highlights of the reviewed power supply are its voltage regulation and noise and ripple levels.
Voltages have to be as close to their nominal values as possible. The ATX12V specification allows outputs to be within 5% of their nominal values (10% for the -12 V output). We consider a power supply to be “flawless” when its outputs are within 3% of their nominal values. With the AX760i, Corsair promises 1.5% voltage regulation for the +12 V, +5 V, and +3.3 V outputs, and 3% voltage regulation for the +5VSB and -12 V outputs. This is simply unheard of.
As for ripple and noise levels, the ATX12V specification allows them to be up to 120 mV at the +12 V and -12 V outputs and up to 50 mV on the +5 V and +3.3 V outputs. Corsair promises maximum ripple and noise levels of 40 mV for the +12 V, -12 V, and +5VSB outputs, and 30 mV for the +5 V and +3.3 V outputs. Of course, during our tests we will check to see if these claims are true.
Another highlight of the Corsair AX760i is a “self-test” button, which commands the power supply to check if it is working properly. (This function tests the fan as well.)
The Corsair AX760i is 6.3” (160 mm) deep. It uses a 120 mm ball-bearing fan on its bottom (Yate Loon D12BH-12). Note, in Figure 3, how there is a thermal sensor (the green component) right in front of the fan. This fan remains off while the power supply is delivering up to 30% of its labeled wattage (i.e., up to 228 W).
The modular cabling system from this power supply has 15 connectors: two for the main motherboard power connector, six for video card and ATX12V/EPS12V connectors, six for peripheral and SATA connectors, and one for the Corsair Link device. This power supply comes with the following cables:
- Main motherboard cable with a 20/24-pin connector, 23.6” (60 cm) long
- One cable with two ATX12V connectors that together form an EPS12V connector, 24.8” (63 cm) long
- One cable with one EPS12V connector, 24.8” (63 cm) long
- Two cables, each with one six/eight-pin connector for video cards, 23.6” (60 cm) long
- Two cables, each with two six/eight-pin connectors for video cards, 23.6” (60 cm) to the first connector, 5.9” (15 cm) between connectors
- Three cables, each with four SATA power connectors, 15.7” (40 cm) to the first connector, 3.9” (10 cm) between connectors
- Two cables, each with four peripheral power connectors, 17.7” (45 cm) to the first connector, 3.9” (10 cm) between connectors
- Two adapters to convert a standard peripheral power connector into a floppy disk drive power connector
All wires are 18 AWG, which is the minimum recommended gauge, except for the main motherboard cable, which uses thicker wires (16 AWG).
The number of connectors is outstanding for a 760 W power supply, allowing you to install up to three high-end video cards that require two auxiliary power connectors each. The number of SATA power connectors (12) is also impressive.
In Figure 5, you can see the Corsair Link device, which allows you to monitor the power supply using Corsair’s software.
Let’s now take an in-depth look inside this power supply.
- 1. Introduction
- 2. A Look Inside the Corsair AX760i
- 3. Transient Filtering Stage
- 4. Primary Analysis
- 5. Secondary Analysis
- 6. Power Distribution
- 7. Load Tests
- 8. Ripple and Noise Tests
- 9. The Corsair Link
- 10. Overload Tests
- 11. Main Specifications
- 12. Conclusions