Corsair AX1600i 1600W Digital Power Supply: features, specs and who it suits

The Corsair AX1600i (model CP-9020087-NA) is a 1600-watt ATX power supply for high-end PCs. It is fully modular, certified to the 80 PLUS Titanium efficiency level, and digital, which means it can be monitored and adjusted from software. It is designed for builds with several graphics cards or other heavy power demands.

What 1600 watts and Titanium efficiency mean

The wattage is the continuous output the supply can deliver. Most gaming PCs need far less, so 1600W is for systems with multiple GPUs, workstation parts or heavy overclocking. Corsair lists the continuous output temperature as 50°C.

80 PLUS is a certification of how efficiently a supply converts wall power into the DC power a PC uses. Titanium is the highest tier, requiring very high efficiency across a range of loads. Corsair says the AX1600i delivers over 94% efficiency and describes it as better than 80 PLUS Titanium. Higher efficiency typically means less heat produced as waste.

Gallium nitride transistors

Corsair says this is the only enthusiast PSU to use Totem-pole PFC with gallium nitride (GaN) transistors. GaN parts switch faster and with less loss than traditional silicon, which Corsair says allows greater efficiency in a smaller form factor.

Components and electrical performance

Corsair lists 100% 105°C-rated Japanese capacitors. Capacitors smooth the output, and higher-rated parts are generally chosen for long life under heat. Corsair also describes stable voltages and ultra-low ripple noise. Ripple is the small fluctuation left in the DC output, and lower is better for sensitive components.

Digital control with Corsair Link

The digital design connects to Corsair Link software. Corsair says you can monitor voltages and efficiency, adjust fan speeds and power settings, and switch between single-rail and multi-rail overcurrent protection (OCP) on the fly. Single rail suits heavy loads on one line, while multi-rail splits the limits for extra protection per connector group.

Cooling and noise

Zero RPM Fan mode lets the fan stay off at low and medium loads, which Corsair says gives near-silent operation. The fan uses a fluid dynamic bearing.

Fully modular cables

All cables detach, so you connect only those your build needs. Corsair describes the low-profile cable set as easy to install and good looking. Fewer cables generally means better airflow and tidier wiring.

Size

The unit measures 7.9 x 5.9 x 3.4 inches (about 20 x 15 x 8.6 cm) and weighs 5.8 lb (about 2.6 kg). That is deeper than many standard ATX supplies, so check case clearance.

Who it suits

It suits builders of workstations, multi-GPU systems and enthusiast PCs who want high capacity, software monitoring and quiet running at light loads.

What to check before you buy

• Actual wattage need: add up your components' power draw, and keep headroom.
• Case fit: confirm the case takes this depth of ATX supply.
• Connectors: check the cable set against your GPUs, motherboard and drives.
• Wall circuit: a 1600W supply draws heavily from a household outlet. Check your circuit capacity and local electrical codes.
• Software: Corsair Link needs a connection to the PC. Check the connector it uses.
• Installation: follow the manual and switch the supply off and unplug it before working inside the PC.

The short version

• 1600W fully modular ATX power supply, model CP-9020087-NA.
• 80 PLUS Titanium, with over 94% efficiency per Corsair.
• GaN transistors with Totem-pole PFC.
• Digital control and monitoring through Corsair Link.
• Zero RPM Fan mode for near-silent operation at low and medium loads.

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