PO3-620 ATX2 and ATX3, do I need to connect to both the ATX2 and the ATX3 with the new PSU?

NovaDev
NovaDev Member Posts: 4 New User
edited January 13 in Predator Desktops

I have a motherboard similar to the one shown in this discussion, but it doesn't exactly answer my questions.

I too am upgrading my PSU, and the original PSU is connected to BOTH the ATX2 and ATX3 ports (?) as well as the 6 pin port on the other side of the mobo. The new PSU doesn't have a connector for the ATX3 - the question is: do I need to connect to both the ATX2 and the ATX3 with the new PSU? The OEM PSU also has the connectors labeled as P2 and P3.

The 6 pin connector, for its part - can I use one of the PCIe cables for the power on that side? The PCIe connector fits that port just fine, but … frying my mobo isn't on the agenda. So how do I handle this piece?

[Edited the thread to add issue detail]

Answers

  • StevenGen
    StevenGen ACE Posts: 13,428 Trailblazer
    edited January 13

    The Predator PO3-620 desktop doesn't have a 3rd ATX 3 plug, its got the following as shown highlighted below in the mobo diagram and the power connection caption below. have a look at this guide here for "All Power Supply Cable Types EXPLAINED". Good luck and hope this helps you out some more.

    PO3-620 power plugs

    • ATX2 - 4-Pin ATX power connector
    • ATX1 - 6-Pin ATX power connector i

    PO#-620 PSU connection

    OEM PO3-620 PSUs

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  • NovaDev
    NovaDev Member Posts: 4 New User

    From this image, there are indeed two plugs, one is ATX2, the other is ATX3, and both of them had a power connector plugged into each one (see other images). My mobo has two plugs just like this. So I'm back to my question. Do I need to plug something into both?

    And my other question, which is can I use the PCIe connector to go from my PSU to the mobo for the 6x2 connector?

  • StevenGen
    StevenGen ACE Posts: 13,428 Trailblazer

    The top 2x 4pin plugs (see caption below) are the main power plugs for your mainboard that power the cpu and board, the 1x 6 pin is for the Gen 3 PCIe x16 gpu port for extra power.

    I presume that the new PSU that you have has a 24 pin main power plug and its a modular type PSU (which doesn't matter if its not modular) the main aim of the PSU is to power the board first which you need a 24 pin to 2x 4 pin connectors if you can get such an adapter cable? Which I don't think that you can, that is why these Acer proprietary prebuilt desktop boards are so annoying as you can't upgrade the PSU.

    Note: I can't give you a definite answer on those questions, as I don't want to advice you on anything that will fry your board. But I know the theory and that is what I've given you above. Good luck.

    These are the two mainboard 2x 4 pin main power plugs that your new PSUs 24 pin main plug should plug into which I don't know how you will be able to achieve that, as there are 24 pin to 8 pin cables but I haven't seen a 24 pin to a split 2x 4 pin cable adapter.

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  • NovaDev
    NovaDev Member Posts: 4 New User

    Ok - seems like the 6 pin connector is ATX after all - but I still don't know if I can plug in PCIe power from the new PSU into that slot.

  • StevenGen
    StevenGen ACE Posts: 13,428 Trailblazer
    edited January 14

    Maybe other community member can help you out further if they have done this same upgrade also, but as you are attempting this upgrade, let us know how you progress, as this will be very useful information for other community members also, as not many members have posted an upgrade like you are doing, as most replace the mainboard to a new and similar chipset cpu socket and ram type with a 24 pin type board and upgrade the PSU to a 24 pin modular type PSU and fit that into either the same Nitro case or get a new case. Good luck.

    If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

  • billsey
    billsey ACE Posts: 35,601 Trailblazer

    It looks like they made a mid-year rev to the motherboard, and populated that second PCIe power connector. If you look at the diagram from the SG it has just f9illed solder holes where the connector is on the later MBs. Those connectors are designed to provide auxiliary power for the PCIe slots, and are limited a bit in how much power can go through each, which is why there is two of them. IIRC they originally topped out the GPU shipped with the models with a 2070, then later added support for a 2080, which needed that little bit of extra power going to the slot.

    So, in answer to your original question, which GPU will you have in the system after the PSU upgrade, what power connectors are on the GPU card itself, and what auxiliary connectors does the PSU provide?

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  • NovaDev
    NovaDev Member Posts: 4 New User

    The new GPU is Galax RTX 4070 - which is why we needed a new PSU. Below are images of the PSU and the cables it seems like I need to use for the things.

    The one labeled "CPU" is a 4x2 which splits into 2 2x2, but of those two, only one fits in the ATX2 slot, and nothing fits the ATX3 slot.

    The one labeled PCIe is a 6x2 +2 (not sure of the correct notation, but I can make it a 8x2 if needed, but I don't in this case), and that fits nicely into the 6x2 slot.

    As you can see from the images, both the CPU and PCIe cords are plugged into the (surprise!) CPU/ 6 + 2 PCIe slots (there's 4 total - I just put the two cords next to each other).

    What I have yet to do is plug everything in with actual power. I'll use another one of the CPU/ 6 + 2 PCIe slots to power up the new GPU.

  • billsey
    billsey ACE Posts: 35,601 Trailblazer

    It doesn't look like that PSU is designed for an ATX12VO designed motherboard. You will have to build a custom cable to go from the 24 pin ATX to the 6 pin on the motherboard and a Y cable for the PCI-E to break the eight pins into two 4 pin connectors, if it's going to work at all.

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