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PSU issue in Upgrade

  • 08-11-2024 09:06PM
    #1
    nozzferrahhtoo
    Registered Users, Registered Users 2 Posts: 9,363 ✭✭✭


    Hi all. I never did upgrade my system so I am still running the exact system listed here:

    https://www.boards.ie/discussion/comment/120595452#Comment_120595452

    I however just came into:

    1. AMD Ryzen 7 5700X3D
    2. 16GB Gigabyte GeForce RTX 4070 Ti SUPER Gaming OC Aktiv

    Removed old GPU and CPU and put in new CPU and tested the power. System powered on and stayed on.

    Installed the GPU with no power. System powered on and stayed on.

    Now comes the problem:

    The GPU comes with a Power Adapter that converts 2 PCIE power cables from the PCU into a single 12 pin that goes into the GPU.

    The moment however that I connect 2 cables into the adapter my system no longer powers up. This is regardless of whether the 12 pin end is connected to the installed GPU or not. If the two PCIE cables are coming out of the PSU but are not plugged into this "adapter" then everything is ok.

    So I guess that this means there is only 2 possible issues.

    1. The PSU is not capable of this and is detecting the merging cable and is refusing to boot up.
    2. The merging cable/adapter itself is faulty.

    Does anyone know a quick way to eliminate option 1 here. I am not sure what to read/look for in the specs of my PSU to check if this is an issue.

    Thanks all in advance!



Comments

  • #2
    Keith186
    Registered Users, Registered Users 2 Posts: 3,230 ✭✭✭Keith186


    I'm no expert but have a 4070ti card on new build made in April/May.

    This cable was the most confusing part of it!

    I didn't get an 'adapter' per se but it was two cables into one, more like a pre-built adapter I suppose. Don't have much to add other than to say to check all your cables, I had plenty of leftovers.

    The cable I plugged in had 600W printed on GPU end of it.

    I have 850W PSU and it's going grand with no issues, not sure if it's more modern than yours but doubt that'd make a difference.

    https://pcpartpicker.com/product/BQLdnQ/asus-prime-ap-850g-850-w-80-gold-certified-fully-modular-atx-power-supply-ap-850g



  • #3
    Spear
    Moderators, Computer Games Moderators, Technology & Internet Moderators, Help & Feedback Category Moderators Posts: 26,062 CMod ✭✭✭✭Spear


    If it's not powering up, it suggests the PSU is detecting a short and OCP protection is triggering, and the adapter is faulty.

    So remove it, and stop attempting to use it. Can you borrow another to test with?



  • #4
    nozzferrahhtoo
    Registered Users, Registered Users 2 Posts: 9,363 ✭✭✭nozzferrahhtoo


    Running the PC now on the new CPU and the old GPU. So at least I know I haven't killed the rig in my attempts so far :)

    The adapter cable that came with the GPU could be faulty but I have no access to another one, Id have to order and buy one.



  • #5
    Spear
    Moderators, Computer Games Moderators, Technology & Internet Moderators, Help & Feedback Category Moderators Posts: 26,062 CMod ✭✭✭✭Spear


    https://www.boards.ie/discussion/comment/122818120#Comment_122818120

    I have one, where are located (generally) ?



  • #6
    nozzferrahhtoo
    Registered Users, Registered Users 2 Posts: 9,363 ✭✭✭nozzferrahhtoo


    Kind offer but I live in Germany these days so I doubt you will be dropping one over :)



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  • #7
    Spear
    Moderators, Computer Games Moderators, Technology & Internet Moderators, Help & Feedback Category Moderators Posts: 26,062 CMod ✭✭✭✭Spear


    https://www.boards.ie/discussion/comment/122818167#Comment_122818167

    Ah, yeah, that stops that. The cost and time of sending it would be more than you ordering a new one. Which is annoying as I literally have a genuine MSI 12VHPWR connector sitting on the desk in front of me.



  • #8
    nozzferrahhtoo
    Registered Users, Registered Users 2 Posts: 9,363 ✭✭✭nozzferrahhtoo


    I guess this is the one I should try, as its got the same name as the PSU make:

    https://www.caseking.de/super-flower-dual-8-pin-to-12vhpwr-cable/NESF-097.html?utm_source=geizhals&utm_medium=comparison&utm_campaign=PC-Komponenten%3EKabel%20&%20Adapter%3EInterne%20Kabel%3ENetzteil%3EPCIe%3EAdapterkabel=%20Adapter%3EInterne%20Kabel%3ENetzteil%3EPCIe%3EAdapterkabel&campaign=psm/geizhals&wt_mc=preisvergleich.geizhals.feed&emid=672e828f4d62386c8d0a17eb



  • #9
    Spear
    Moderators, Computer Games Moderators, Technology & Internet Moderators, Help & Feedback Category Moderators Posts: 26,062 CMod ✭✭✭✭Spear


    https://www.boards.ie/discussion/comment/122818270#Comment_122818270

    Super Flower have a good reputation, and something power related like a 12V HPWR connector isn't a time to go cheap or dodgy.



  • #10
    K.O.Kiki
    Registered Users, Registered Users 2 Posts: 18,968 ✭✭✭✭K.O.Kiki


    https://www.boards.ie/discussion/comment/122818366#Comment_122818366

    That IS the correct cable for their PSU though, it says it in the description.

    "Compatibilty: Leadex Titanium / Platinum / Platinum SE und Leadex III Gold Series"



  • #11
    nozzferrahhtoo
    Registered Users, Registered Users 2 Posts: 9,363 ✭✭✭nozzferrahhtoo


    Did some meticulous testing today that if anything has left me a bit more confused than before. Did my testing with no GPU at all (old one removed and new one not added).

    Current setup: GPU powered with single "VGA" power cable, two heads daisy chained, from "XFX playhard". That came with the PSU.

    Test with: New GPU "adapter" and two single head (no daisy) XFX "PCIE" power cables. Also came with the PSU.

    First test was:

    1. Unplug GPU power and remove old GPU entirely. Leave VGA power connected to PSU. System boots.
    2. Plug both heads of the VGA daisy chain into the "adapter". System boots.

    Second Test was:

    1. Unplug GPU power and remove old GPU entirely. Leave VGA power connected to PSU. System boots.
    2. Plug single PCIe cable into PSU. System boots.
    3. Attach ONLY that PCIe cable to the "Adapter". System NO BOOT.
    4. Remove the adapter again to return to step 2 above. System NO BOOT.
    5. Unplug the PCIe cable from PSU to return to step 1 above. System boots.
    6. Repeat with second test PCIe cable: Results all same as above.
    7. Repeat tests 1-6 again but for the OTHER free VGA power port on the PSU. Results again all same as above.

    So I am not sure what this test has proven? I expected steps 1 to 3 were going to go that way. But steps 4 and 5 are something of a surprise. Almost like the PSU "remembers" not to trust that cable until it is removed entirely. Is that normal?

    The test does seem to suggest EITHER the "adapter" is faulty or that the power draw is not compatible with the "PCIe" type cable over the "VGA" type cable. The first test appears to suggest the second theory more plausible.

    Either way I guess the next step is to wait for the higher quality cable I ordered above. Though I could also go out today and source a good quality "VGA" cable in a local shop. 



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  • #12
    nozzferrahhtoo
    Registered Users, Registered Users 2 Posts: 9,363 ✭✭✭nozzferrahhtoo


    Well problem solved and it was my own ass fault.

    I cross posted this thread over on Toms Hardware. And some eagle eyed person noticed my mentioning the "XFX Playhard" cables and pointed out that that is not what usually ships with my particular PSU. Which baffled me because I have a box for ALL my cables (or so I thought) and they were the only PSU cables in there.

    However he posted a picture of the contents of my PSU and in the picture was a black wallet bag for all cables. And my daughter recognized it as having gone to the attic by mistake a few years back.

    Retrieved the bag and installed the GPU again with the PSUs actual own cables and it is working perfectly now.

    Clearly "XFX" do not play as hard as they like to claim hehehe. Though I have no idea where those cables came from. I am assuming they must have come with my 3070 Ventus OR my Tomahawk MOBO.

    Anyway panic over. Time to test this new baby out.



  • #13
    Spear
    Moderators, Computer Games Moderators, Technology & Internet Moderators, Help & Feedback Category Moderators Posts: 26,062 CMod ✭✭✭✭Spear


    I'm a little unclear on a part of this then.

    Did you have a modular cable from another brand of PSU plugged into your Super Flower PSU?

    That could have indeed ended badly if that's the case, they're usually proprietary and wired differently from each other. That would certainly explain why OCP was being tripped by the adapter then.



  • #14
    nozzferrahhtoo
    Registered Users, Registered Users 2 Posts: 9,363 ✭✭✭nozzferrahhtoo


    Yes i seems so, exactly as you said it above. Since these cables were the ONLY ones in my usual cable box, I just accepted without question they were my PSU cables. And in fact once I took the "XFX Playhard" label off they looked near identical to the VGA cable that is already in my rig.

    I have/had no recollection of ever getting any other cables. So I genuinely do not know where they came from or why I have them.

    So it was my own dumb forgetfulness that nearly led to disaster here. Just a nice eagle eyed poster over on Tom's happened to notice these are not the cables from that PSU.

    So I got lucky! But all is well. Thankfully I did most of my testing on a GPUless rig. So I did not kill the GPU with my ignorance.



  • #15
    smuggler.ie
    Registered Users, Registered Users 2 Posts: 4,381 ✭✭✭smuggler.ie


    time to dump that "cable box" i guess.

    Say one that have more than one "box" … 😉

    history of boards 2021




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