Single or Multi Rail, does it even matter?

Soldato
Joined
16 Jun 2005
Posts
3,158
Location
Back in the UK
Ok Electrical stuff is all black magic to me, when people at work pull out a Single line diagram my brain locks up.

I have a 1200w Corsair unit for my New PC that will be getting a 4090 dropped into it,

The PSU has a switch on the back of it for Single or Multirail operation, my very basic understanding is that multi rail splits the power for the +12v into lumps, where as single lets you take all the power on all the connections.

Which should I select, does it even matter?
 
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