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Rails: While many psu's are multi rail, it is better to get a single rail system because with a single rail, the psu can transfer 100% allods gold of the 12v output of the psu to the computer, whereas in a multi rail system, you can face up to 30% distribution loss due to underutilized rails.

Let’s say for example lets say rail 12vr2 is assigned to work for the cpu, and lets say the rail carries 17Amps of power, but the cpu only uses 7A of power, that 10amps in lost, whereas in a single rail system, the system draws from only one rail so the power loss is not there.

Also, let’s say you have a grafix card that required 20A, but the rail it’s using is 17A, you have instability and problems like that, that is why for a sli/crossfire system, you definitely want a single rail psu, because everything draws from the single rail, which has all the power of the psu. whereas if you're trying to sli/crossfire on a quad rail system, which has like power of the psu split up, that 1/4 of the power of the psu might not be able to power the sli/crossfire grafix cards.

While modular cabling does improve airflow, they limit power by increasing the electrical resistance, in fact the voltage drop can be as much as that which would occur in 2 feet of standard wire.