Articles: Cases/PSU

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Cables and Connectors

The three PSUs from Corsair are all modular and come with similar sets of cables. The AX650 model comes with the following cables:

  • One mainboard power cable with a 20+4-pin connector (59 cm)
  • One CPU power cable with a 4+4-pin connector (64 cm)
  • Two dual graphics card cables with two 6+2-pin connectors (59 cm)
  • Two cables with four PATA power connectors on each (40+15+15+15 cm)
  • Two cables with four SATA power connectors on each (40+15+15+15 cm)
  • Two adapters from a PATA power connector to a floppy-drive plug (10 cm)

The 750 and 850-watt models add to this a third cable with four SATA power connectors and a 64cm CPU power cable with an 8-pin connector.

The selection of cables is similar to that of the original Seasonics but there are no cables with mixed PATA and SATA connectors. Perhaps the unified cables help reduce the manufacturing cost somehow. Although less versatile, the PATA and SATA cables of the Corsair PSUs can offer four connectors each as opposed to two or three connectors on the PATA/SATA power cables of the Seasonic X Gold series.

The cables are flat but rather stiff.

The connectors are not labeled on the PSU (to save on the paint?) but you won’t be able to connect anything wrong. The different types of cables vary in the number of pins. The keys won't even let you plug a small male connector into a bigger female one.

So, the cable system, like the accessories, is the same as with the Seasonic PSUs but somewhat simpler and cheaper, with less attention to the ease of connection.


As expected, the specifications are almost identical to those of the corresponding Seasonic PSUs except that the total output power of the two junior models is 10 watts lower: 650 and 750 watts instead of Seasonic's 660 and 760 watts. People at Corsair seem to be fond of round numbers. As a result, they had to lower the load capacity of the 750W model’s +12V rail by 1 ampere so that it wasn't higher than the PSU's total output power.

The rest of the electrical parameters coincide with those of Seasonic's original products and are up to today's requirements. Each PSU can deliver almost all of its power across the +12V rail. The load capacity of the +3.3V and +5V rails is rather low, yet modern systems will need no more than one third or one half of that, anyway.

And we can remind you that these PSUs comply with the 80 PLUS Gold standard.

UPS Compatibility

Working together with our APC SmartUPS SC 620, the Corsair AX650 was stable at loads up to 415 watts when powered by the mains and could switch to the UPS’s batteries at loads up to 300 watts.

The higher-wattage models could work with the same UPS at loads up to 425-428 watts but neither of them could switch to the batteries even at 280 watts.

These results are worse than those of the original Seasonics which could switch to the UPS's batteries at 320-340 watts. We don't have enough statistical data to say if it's just an accident or not.

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