What are Corsair iCue Dual-Rail vs Single-Rail OCP options

deskbound3

deskbound3

Member
The Corsair HXi Series PSU's offer an option in their iCue software. You can choose between Single-Rail OCP and Dual-Rail OCP.

HXi_iCUE_4.width-1000.format-webp.webp


What is the purpose of these options? It makes it sound like you can switch between single-rail and dual-rail on-the-fly, but that can't be right. Maybe @jonnyGURU could provide insight? I'm puzzled because if Multi-rail changes the output of the connections, how do I know which connection is on which rail?

Here is the label on my 2025 HX1200i, indicating it's a single-rail unit:
Corsair HX1200i.jpg

Some single-rail vs multi-rail reading material from jonnyguru: https://web.archive.org/web/20120111222017/http://www.jonnyguru.com/forums/showthread.php?t=3990
 
it switches only the overcurrent protection, not the supply rails themselves, since there's only one rail.
Basically; the overcurrent protection will either trigger if one of your 12V sockets is overloaded (multirail) or have only one general OCP for the entire 12V rail, meaning it won't detect discrete cables overloads. That's mostly for extreme overclock where overclockers don't want any protection per socket, to avoid stuff shutting down while they push power limits to crazy levels, while still remaining within the PSU's total power limit.
For home use, there's basically no reason to go single rail.
 
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