Is running a single high end GPU off of daisy chained PCIe connectors ok? - Overclock.net - An Overclocking Community
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Is running a single high end GPU off of daisy chained PCIe connectors ok?

 
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post #1 of 6 (permalink) Old 05-30-2019, 03:13 PM - Thread Starter
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Is running a single high end GPU off of daisy chained PCIe connectors ok?

I just upgraded from a 7 year old Corsair TX550m to a Seasonic Prime Ultra Platinum 750w, and it's powering an overclocked RTX 2080. The PCIe cables on the Prime are the kind where the second 6+2 is daisy chained off of the first, so all power to the card is running through just one set of wires instead of two. Now obviously I don't think the Prime Ultra is going to have trouble powering a single 2080, but it still feels wrong having all the current run through just one cable and PSU side connection. Should I use both PCIe cables and just have the daisy chained connectors hang loose?

Yes I know 750w is overkill, was originally going to get another 550w or 650w, but I'm planning on keeping this psu at least as long as my old one and have no idea what kind of future hardware I'm going to have, the price difference wasn't that big, and now I never have to worry even if I go with an overclocked 12 core cpu and radeon VII level card in the future.

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post #2 of 6 (permalink) Old 05-30-2019, 03:15 PM
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Can cause a burnout if the system is heavily overclocked. Happened twice to me. Using separate cables fixed the issue. Not cheap PSU's either! Corsair and SeaSonic. Had both RMA tested. Reports concluded the same outcome..., PCI-E cables to blame, causing the system to draw power from other areas to compensate. In my case, it draw from the EPS, causing a burnout. Each report recommended using separate PCI-E cables. Have done for years ever since, never had a burn out since!

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post #3 of 6 (permalink) Old 05-30-2019, 03:16 PM
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No there is no problem at all with using both plugs from the same cable, at least not that I've ever heard of. Maybe on older PSUs or low quality PSUs it could be, but definitely not on the PSU you have now.

Quote: Originally Posted by BradleyW View Post
It is OK for some, but it has caused a burn out for me in the past. Twice in fact. I run separate cables, always.
It's when I had a 290X. I overclocked it and the cables couldn't handle it, so the motherboard tried to draw power from the EPS cable, causing a burnout.
As stated, happened twice. First PSU was Corsair, the other was SeaSonic. Not cheap components.
Interesting. I used to work at a gaming PC manufacturer and we always built the PCs with as few cables showing as possible. It was never an issues as far as RMAs.

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post #4 of 6 (permalink) Old 05-31-2019, 12:23 AM
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Its very rare but not unheard of for PSU cables to melt when using only a single cable on extremely high powered cards have seen it happen with Seasonic PSU´s before but as i said its very rare
Its probably fine to use a single cable but if you have two cables in the box and have room in the case for both cables i would both just in case

If you had a RTX 2080 Ti i would say definitely use two cables

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post #5 of 6 (permalink) Old 05-31-2019, 01:15 AM - Thread Starter
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Thank you all for the input. Sounds like it's probably advisable to add the second cable and sacrifice some cable management cleanliness.

Why do manufacturers do the daisy chain connector method? I can't imagine adding another 50cm of cable for a whole separate connector would add any appreciable amount to the cost to build, but it does guarantee a much more robust power deliver path. Especially on a high end unit like the Prime Ultra.

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post #6 of 6 (permalink) Old 05-31-2019, 01:20 AM
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Quote: Originally Posted by TheRacker View Post
Thank you all for the input. Sounds like it's probably advisable to add the second cable and sacrifice some cable management cleanliness.

Why do manufacturers do the daisy chain connector method? I can't imagine adding another 50cm of cable for a whole separate connector would add any appreciable amount to the cost to build, but it does guarantee a much more robust power deliver path. Especially on a high end unit like the Prime Ultra.
A card like an RTX 2070 would have no problem using a single cable so its only really a problem with the high end card and there are more people buying mid range cards then there are people buying high end cards so its not a problem for most people

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