The following few pages we'll be focusing on what both PSU's have or have not in common. We'll be checking out the connectivity, efficiency and see how the PSU's handles a real-life load, but before we do that let us first compare the specifications...
Both power supplies come with a single 12v rail design which in both occasions can put out around 60 Amps. The Corsair AX750 allows for the most output power, mostly because it comes with a tad stronger 12V line. Coolermaster's unit on its turn can have the most combined 3.3 & 5V power, on a relative perspective I guess it's safe to say both PSU's or made for the same purpose, if that extra 50W continuous power is of your concern then maybe you wanna look out for something stronger just to have that little more headroom.
Left: Coolermaster SPG700 modular cables, right: Corsair AX750 modular cables
Compared with CM's SPG700 the Corsair unit comes quite some more modular cables, atleast that's how it seems on first sight: don't forget that CM's PSU comes with some connectors already hard connected to the PSU.
Main connectors like 24 pin ATX support, 4+4 CPU power plug and 6+2 PCIe power connectors are found for both models, and connectivity isn't scarce for either of them. The 4x molex connectors with Coolermasters PSU's is a bit on the low side for a high end device, floppy and SATA connectivity is good though. The Corsair AX750 offers the most connectivity of the two, with 12x SATA, 8x Molex and even 2x Floppy you're actually having it quite luxurious.
When comparing the length of the modular cables we notice the biggest differences between PCIe, molex, floppy and SATA cables. Where Coolermaster comes with the longest PCIe cables, Corsair makes it possible to even hook up SATA/Floppy/other peripheral hardware that might not even be inside your housing, some of their wires measure nearly one meter long!
Let's move on to electrical testing these units.