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The Professional Series Gold AX series PSUs have thermally controlled fans which will vary the fan speed depending on both the loading and temperature of the PSU. Check out the video below for a specific explanation:

The 24-pin ATX connector for the AX series PSUs have a split connector that plugs into the AX series PSU.  The single 24-pin connector is the end that will connect directly to your motherboard.  See below for a video explanation.

You can download a PDF file containing all of the cable lengths of Corsairs PSUs in the following link: Download Here

The HX1050 is the updated version of our popular HX1000 PSU.  In addition to a slightly different look, we have moved to a single 12v rail design, and we have also been able to increase efficiency to 80 Plus Silver compliance to match our other HX series PSUs.

BIOS and software readings are never 100% accurate and they can fluctuate. The only way to measure the rails accurately would be to use a digital multi-meter.

ATX spec also indicates that as long as the voltage stays within 5% of the rating for the rail then the PSU is within spec. For instance on the 12v rail this would equate to 11.4v-12.6v.

In order to start up, the power supply requires two things. A load (a device connected to it requiring power) and a signal. The switch on the back of the PSU simply tells the power supply to go into standby mode and await a signal from the motherboard to actually turn on.

Please set up a case in Tech Support Xpress (TSX), and let us know which PSU you have and which cables you need.

Our power supplies ship with an 8-pin connector that splits in half. Use half of this connector for the 4-pin EPS/ATX 12v connector on your motherboard.

We suggest using our PSU finder tool to answer this question. You can find it by clicking here.

The PSU finder results are accurate estimates which would correlate to Corsair Power Supplies ONLY. We cannot guarantee that a non-Corsair unit of similar wattage rating would be equivalent.