On 13/05/2021 22:39, T i m wrote:
On Thu, 13 May 2021 16:53:30 -0400, Paul
wrote:

Do you know what they mean by 'single rail'?

https://www.scan.co.uk/products/600w...-psu-black-psu


One +12v rail offering a lot of current as against two. That's how they
started out until someone decided that so much demand on +12v meant that
two +12v would be a better idea. Lower currents per rail. OK, but
loading the two rails correctly didn't work out for some systems. So
some have returned to a single, many ampere, rail.

I think that this really kicked off when all the PCIe connectors were
loaded onto the same +12v rail of a two-rail PSU.

PA