does number of 12v rails matter?

WINTERLORD

Distinguished
Sep 20, 2008
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i always thought a single 12volt rail is best . however i found this PSU antec 900watt high current gaming PSU? i know antec is a good company but for a crossfire setup or maybe even a 3way crossfire would a antec gaming psu be good or better to get a single 12v rail psu