Nu tā jau nu tīri nav, jo parasti jau nodeg kāda mikrene. Labums principā ir tikai drošības ziņā, lai nepārslogotu barokli. Ja pareizi saprotu, tad viņas pat neskaitās atsevišķas fiziskas līnijas: “In computer power supplies that have more than one +12V power rail, it is preferable for stability reasons to spread the power load over the 12V rails evenly to help avoid overloading one of the rails on the power supply.
The ATX12V 2.x and EPS12V power supply standards defer to the IEC 60950 standard, which requires that no more than 240 volt-amps be present between any two accessible points. Thus, each wire must be current-limited to no more than 20 A; typical supplies guarantee 18 A without triggering the current limit. Power supplies capable of delivering more than 18 A at 12 V connect wires in groups to two or more current sensors which will shut down the supply if excess current flows. Unlike a fuse or circuit breaker, these limits reset as soon as the overload is removed.
Because of the above standards, almost all high-power supplies claim to implement separate rails, however this claim is often false; many omit the necessary current-limit circuitry,[5] both for cost reasons and because it is an irritation to customers.[6] (The lack is sometimes advertised as a feature under names like “rail fusion” or “current sharing”.)”
.
