Corsair HX1500i 1500W Power Supply: features, specs and who it suits

The Corsair HX1500i is a 1500-watt ATX power supply for desktop PCs. It sits at the high-power end of the range, aimed at builds with demanding graphics cards and processors, and it brings modern connector standards, a quiet fan and software monitoring together in one unit. Here is what its main specs mean in practice.

What ATX 3.1 and PCIe 5.1 mean

Corsair describes the HX1500i as Intel ATX 3.1 certified and compliant with the PCIe Gen 5.1 platform. In general, the ATX 3.x standards were written for modern graphics cards, which can briefly draw far more power than their average draw. The standards ask a power supply to ride out those short transient spikes without shutting down, and they add the newer 12-volt high-power connector used by recent graphics cards.

Corsair says the unit resists transient power spikes. The listing's description also mentions ATX 3.0 and PCIe 5.0 compliance, which are the earlier steps of the same standard. Check the manual for which cables are included and how they connect to your graphics card.

Fully modular cabling

Every cable on the HX1500i detaches from the unit. You plug in only the cables your system needs, which leaves fewer loose leads inside the case, makes routing easier and helps airflow. In a small or glass-sided case, that tidiness is often the main reason people choose a modular design. Always use the cables that come with the unit, because cable pin layouts differ between makers and models.

80 PLUS Platinum efficiency

80 PLUS is a testing programme that measures how much of the power drawn from the wall reaches the PC's components, with the rest lost as heat. Platinum is one of the higher tiers, typically requiring roughly 89 to 92 percent efficiency depending on load. In practice, a more efficient unit wastes less energy and produces less heat for the fan to remove.

Quiet cooling with a zero RPM mode

The HX1500i uses a 140mm fan with a fluid dynamic bearing, which Corsair says gives quiet and long-lasting performance. Fluid dynamic bearings generally run more smoothly than sleeve bearings and tend to last longer.

At low and medium loads, Corsair says the fan switches off entirely. That makes normal desktop work, browsing and video playback close to silent, while the fan starts up again under heavy load such as gaming or rendering.

iCUE software and digital control

The unit is a fully digital design that works with Corsair's iCUE software. According to Corsair, you can create custom fan curves, monitor power settings and switch between single-rail and multi-rail overcurrent protection (OCP) while the PC is running. Single-rail pools all the power into one limit, while multi-rail splits it into several protected channels. Which suits you depends on your components, so the manual is the place to start.

The description also lists Japanese 105°C-rated electrolytic capacitors, a ten-year warranty and Modern Standby sleep support for faster wake-ups.

Size and weight

The listing gives the dimensions as 7.9 x 5.9 x 3.4 inches (about 20 x 15 x 8.6 cm) and a weight of 5.3 lb (about 2.4 kg). Standard ATX power supply bays accept that footprint, but always confirm the depth with your case maker's maximum PSU length, especially with cables attached.

Who it suits

A 1500W unit has more capacity than most PCs need. It suits builders planning a high-end graphics card or several power-hungry components, or anyone who wants plenty of headroom for future upgrades. A smaller build with modest parts will usually be well served by a lower-wattage unit.

What to check before you buy

• Total power need: add up your components' rated draw, and leave headroom for spikes.
• Graphics card connector: confirm which power connector your card uses and that the supplied cables match it.
• Case fit: check that the case supports an ATX power supply of this length.
• Wall outlet: a 1500W unit can draw a lot from the outlet. Check your circuit and follow the manual.
• Software: iCUE features need a compatible system, so check that it fits your setup.
• What's in the box: check which cables are supplied before you start the build.

The short version

• A 1500W fully modular ATX power supply from Corsair.
• Intel ATX 3.1 certified, with PCIe Gen 5.1 support.
• 80 PLUS Platinum efficiency and Japanese 105°C capacitors.
• 140mm fluid dynamic bearing fan, with a zero RPM mode at low and medium loads.
• iCUE control of fan curves and single- or multi-rail OCP, plus a ten-year warranty.

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