The Antec HCG-400M power supply has a maximum wattage output of 400W. This is a very low PSU capacity, and should only be used when powering a low power system. Remember that a higher PSU capacity does not necessarily equate to a higher wattage output and a more expensive electricity bill. In fact, you may find that a higher capacity PSU will function more efficiently than a lower capacity PSU because it is dealing with a lower percentage of its maximum load - that is, it is not being stressed to the same extent.

The Antec HCG-400M has an 80 Plus rating of Bronze. This means the PSU operates at average efficiency levels of at least 82%, 85%, and 82% for loads of 100%, 50%, and 20% respectively. Bronze is the fourth-best 80 Plus certificate available, and as such the Antec HCG-400M is very efficient and is a decent PSU choice. The actual efficiencies for this PSU are 84.52%, 85.83%, and 82.98%, for loads of 100%, 50%, and 20%.

The dimensions of the Antec HCG-400M (LxWxH) are 0cm x 150cm x 0cm. Make sure to compare these measurements against the case you desire if planning on using it in a build.

The Antec HCG-400M is modular, meaning that cables can be taken out and connected back in as necessary. This can make cable management much easier, leading to a less chaotic build, and better airflow.

The Antec HCG-400M is not designed for low volumes, meaning that its constant drone while your PC is on could potentially be noticeable and irritating, though this may only be a problem for those that require silent environments.