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-   -   How do multi rails in a power supply work in conjunction with a graphics card? (https://www.overclock.net/forum/31-power-supplies/1733800-how-do-multi-rails-power-supply-work-conjunction-graphics-card.html)

computerdude92 09-27-2019 12:48 AM

How do multi rails in a power supply work in conjunction with a graphics card?
Let say I have a single graphics card and it requires 30A on the +12v rails. If my power supply has two rails at 24A each, will a 30A graphics card work safely? Would the extra 6 amperage come out of the second rail? I've never understood multi PSU rails and I would like an easy explanation please.

Thanks guys.

shilka 09-27-2019 02:02 AM


computerdude92 09-27-2019 02:17 AM

Thanks, the post has a joking nature to it so I'll have read it a few times to understand. I can't find where they talk about graphics cards yet.

shilka 09-27-2019 02:18 AM

There is no single answer to the question in the OP as it depends on which brand and model you are talking about
If you are confused why not just buy a single rail unit?

computerdude92 09-27-2019 02:31 AM

Does this answer below apply to Seasonic PSUs? I have a 600W model with two +12v rails.


I read that multi rail PSUs are safer and more reliable.

shilka 09-27-2019 02:41 AM

They are safer in the sense that if something short circuits on one rail it wont damage anything on the other rail(s) but i would not say they are more reliable
What model is that Seasonic you have?

computerdude92 09-27-2019 02:52 AM



I've used it for roughly two years. Still works.

Notice that the Newegg description does not show the rails correctly. Please look at the picture label in the item's photos.

shilka 09-27-2019 02:56 AM

What you have is there is 11 years and not all that great as its group regulated
Buy a new PSU if you are using it in a modern system

computerdude92 09-27-2019 03:01 AM

What do you mean by group regulated? I bought it brand new two years ago. I only use older computers from 5+ years ago, with no plans to get anything newer cause modern computers have built in backdoors and spying. Do you think this older PSU will work fine for me? My new graphics card I plan on getting is from 2012. It's the FirePro S7000. I might get the beefier S9000 instead. I'm saving this PSU for a new single socket g34 build.

shilka 09-27-2019 03:24 AM

Group regulated means that all of the rails are treated as one big group instead of being independently regulated which means that voltage regulation is poor

Group regulation is something that was common back in the old days to save costs but today anything using group regulation is outdated and obsolete and its almost dead and gone save for some low end budget units like say the low end EVGA units and the Corsair VS series

If you crossload a group regulated PSU it will often go out of ATX specifications as it cant handle that
Dont know how you found a PSU from 2008 new and for sale in 2017

What you have is a budget version of the Seasonic S12II
Its not god awful or anything like that but its not modern or great

Edit: backdoors and spying what the.... have you ever heard of getting a VPN in that case

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