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-   -   HX 750 Platinum Single/Multi rail switch (https://www.overclock.net/forum/31-power-supplies/1732432-hx-750-platinum-single-multi-rail-switch.html)

Lexi is Dumb 08-30-2019 03:04 PM

HX 750 Platinum Single/Multi rail switch
 
So I've had this PSU for like 7 months now and I never bothered finding out what this switch is for or what setting is ideal. Googling it just added to the confusion, mostly being answers on single vs multi rail PSUs from a long time ago as far as I could tell.

Basically make it simple for me like i'm a complete idiot.. for my basic 3700X/2080 system do i set it to multi or single? I think it's on single right now and I don't think it's been the cause of any problems I've had but I'm doing maintainence and a full rebuild later today because I want to change the cable kit anyway and remove some stuff I don't need in there anymore so I figured I might as well find out so I can switch it while i'm already in there.

shilka 08-31-2019 02:03 AM

1 Attachment(s)
Its right next to the cables ports but do you need multi rail?

Sm0keydaBear 08-31-2019 10:36 AM

You probably want to listen to shilka, but I'd imagine in that configuration with the 2080, you'd probably want just single rail? Dividing the rails might make less power (insert huge question mark here) and make the GPU unstable? That is, if standard Ohm's law applies to how the multi-rail configuration works lol

Single +12V Rail Mode: +3.3V @ 25A, +5V @ 25A, +12V @ 62.5A, -12V @ 0.8A, +5VSB @ 3A
Multiple +12V Rail Mode: +3.3V @ 25A, +5V @ 25A, +12V1 @ 40A, +12V2 @ 40A, +12V3 @ 40A, +12V4 @ 40A, +12V5 @ 40A, -12V @ 0.8A, +5VSB @ 3A

(From Newegg)

It looks like you might want multiple 12v rail mode for multi GPU setups

Lexi is Dumb 08-31-2019 10:51 AM

Quote:

Originally Posted by shilka (Post 28109872)
Its right next to the cables ports but do you need multi rail?

Sorry I know where it is, I was asking what the point of it is and which to use

shilka 08-31-2019 10:56 AM

Quote:

Originally Posted by Lexi is Dumb (Post 28110234)
Sorry I know where it is, I was asking what the point of it is and which to use

Multi rail is safer because if something goes wrong on one rail the other rails are fine
https://www.overclock.net/forum/31-p...explained.html

The down side to multi rail is you get smaller rails which make it much easier to trip the OCP on the PSU
So if you are overclocking and pushing it really far a multi rail PSU will shut down if you overload one of the rails

You can use multi rail if it makes you feel better but there is really no reason to use it vs single rail it makes little difference in every day use


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