The cable arrangement is great for a 1300W+ class power supply. The four PCI-E cables each have dual 6+2 connectors on them and you really wouldn't expect to need anything less with a power supply of such high output. If I could change anything thought, I would have a few different lengths of SATA cables to help remove some cable clutter.
Rail distribution isn't very simple with the Platimax 1350W, but it is easily balanced. 12V1 and 12V2 take care of the motherboard and auxiliary power to the motherboard. 12V3 and 12V5 are reserved for a pair of PCI-E cables each while 12V4 and 12V6 handle one PCI-E cable and three peripheral cables each.
A Look Inside
Short of the three bulk capacitors, you wouldn't know this was a high wattage unit just by looking at the general layout and component count of the unit. Many of the top tier units have done a large amount of component shrinkage which reduces heat generation and heat loss while increasing overall efficiency of the unit.
A trio of Panasonic bulk capacitors sit on the primary side of the power supply.
The secondary side is littered with Rubycon caps.
ADDA supplies the 140mm fan to provide the active cooling for the Platimax 1350W power supply.
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