Simply put, the "added benefit" of a multi-rail unit is generally to the manufacturer and not to the user.
Up until recently the biggest problem with multi-rail units was that you couldn't simply add the rails together.... they didn't share between the rails, and that meant you were losing Amps if one of the rails was underutilized, and overworking a rail if it had most of the load on it.
Newer multi-rail PSUs (like the Mushkin SKYMTL recently reviewed) have fully active PFC which effectively turns it into a single rail unit when the load on one of the rails exceeds it's rated limits.
From a Graphics card's pov, a strong single 12V rail is preferable as it can react quickly to the sudden demands that newer GPUs can call for.
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