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RTX 2080 Super - Single or Dual PSU Rail?

qwertyk1d

qwertyk1d

qwertyk1d

Associate
Joined
22 Mar 2020
Posts
41
Location
Brighton, UK
I've connected and have been running my 2080 Super for a few days using just the one PSU rail cable (one connector PSU end and a 6 + 4 pin dual connector other end) and haven't noticed any weirdness but I've read in a few places that you should run two rails to the graphics card?
 
Not sure tbh, back when psu heavy cards were coming out the recommended was one strong single rail as multiple rails were weaker and split the power. Maybe these days psu are better for more than a single rail delivering 32 or whatever amps on the rail or whatever power thing it is.
 
Rails are not cables rails btw i.e 2 pcie on one long cable, rails are the things in the psu. I have 1 strong rail but use 2 cables from psu to gpu. Two cables use the single rail in my corsair hx 620w psu.
 
Oh gotcha. I did wonder. Will need to do some research then, might just do a test myself and see what gains I get from using two cables vs one, if any.
 
Looks like theres 1 pcie 8 pin on the psu at top right corner and 3 8pin pcie under it (bottom right). Use two cables which are only for gpu i.e no other bits on the cable for hdd or whatever, there shouldnt be but u never know. Then use those 2 cables for any of the 3 bottom right pcie ports on the psu. Those 3 are probably all on 1 rail is my guess but the top right one is probably on a different rail.

Hmm after looking ive noticed this review and it says its all single rail so i guess it doesnt matter which pci-e ports are used. So up to you.

https://linustechtips.com/main/topi...cus-gx-overview-and-what-are-the-differences/
 
qwertyk1d said:
Why is that? I just read my PSU manual and it recommends to use two rails. Is that antiquated?
Click to expand...

I think the posts above have explained this well enough. Put it this way, if a PSU has a single rail @ 60 amps for example, you get 60 amps. If a PSU has two rails @ 30 amps, that usually doesn't equate to 60 amps total, nearer to 50.

For me, a strong single rail is always preferable given the above.
 
There is a thread here somewhere (try search) and its from Johnny Guru (Corsair) and the BS marketing with Single rail VS Multi
rail (with a addition of USA voltage and power draw fire risk) they are all internally Single Rail and always have been.


EDIT:

 
If both GPU cables are coming off a single rail, it makes not a jot of difference. Single cables with split GPU connecters are rated to carry the full wattage, or PSU manufacturers wouldn't provide them.

You're powering a GPU, not a kettle.
 
ArmitageShanks said:
If both GPU cables are coming off a single rail, it makes not a jot of difference. Single cables with split GPU connecters are rated to carry the full wattage, or PSU manufacturers wouldn't provide them.

You're powering a GPU, not a kettle.
Click to expand...

Genuine question, would it not split the current between both cables and therefore reduce the amperage load on the cables in high current situations? Seen plenty of those PCI-E connectors melt.
 
I think you'd be fine. I deliberately set mine up to use separate cables albeit on the same RAIL (as mentioned rails are 12v, 5v, 3v etc within the PSU).

A long as a known brand PSU of 500W+ would have thought all good to go with either.
 
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