Originally Posted by railfan844
Almost all psu's have 4 pin cpu connectors. Some of them also have 8 pin, which is just 2 x 4 pin (lower resistance and ripple, no actual power increase).
The 4pin has an artificial limit by ATX standards of 150w
The 8pin has an artificial limit by ATX standards of 300w
Using a 4+4 or 8pin design does not
decrease ripple. It can
lower resistance; though it depends on the cable design, pin crimping, connection security, ect. So just using the 8pin connection does not guarantee lower resistance.
Originally Posted by graphicsman
Sorry I meant 12 volt four pin. I was trying to figure out if a 12 volt rail is supposed to go into the CPU 4 pin connection or is the PSU indicate it
Well the socket you plug your cable into will always determin what voltages the cables (and thus connectors) carry.
You will never have a cable that can only carry 12v (as that would just be silly.)
Though most PSU's are designed so that 4pin/8pin CPU modular connectors are keyed so only the CPU power connector cables will work in them.
Same with SATA/Molex cables or PCIe 6pin/8pin cables.
Though yes, the CPU power connector only supplies 12v to the CPU.