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  1. #1
    ROG Enthusiast Array Gothmoth PC Specs
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    cheaper asus B450/X470 boards get pci 4.0 support expensive ones not?

    do i read this chart correct?

    cheap asus boards get pci 4.0 support on the first PCIE slot and expensive ones not?

    Click image for larger version. 

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    Last edited by Gothmoth; 07-12-2019 at 05:08 PM.

  2. #2
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    This should be related on PCI-E switches and how they are made and where they are located on the PCB. Simpler (and cheaper) PCBs may have less issues due PCB complexity to handle the new signal. That's not a conspiracy. On the other side more expensive PCB have better VRM, which means expensive MBs usually handle better high-end Ryzen 3000 CPUs due to better power delivery and better VRM cooling.
    Last edited by Alessio1989; 07-12-2019 at 11:10 PM.

  3. #3
    ROG Enthusiast Array Gothmoth PC Specs
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    Quote Originally Posted by Alessio1989 View Post
    This should be related on PCI-E switches and how they are made and where they are located on the PCB. Simpler (and cheaper) PCBs may have less issues due PCB complexity to handle the new signal. That's not a conspiracy.
    who told you it is a conspiracy?

    you could think a bit of the money goes into better PCB and signal integrity for OC boards like the crosshair.
    not just water pump connections, fan headers, rgb lighting and stuff.

  4. #4
    TeamROG Moderator Array xeromist PC Specs
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    None of those boards were designed for gen4. Given that the more expensive boards are trying to do more things at the same time it's not surprising they might have issues.

    Also note that no GPU will need gen4 anyway and won't for the life of these boards. The only devices that might use the extra speed would be PCIE SSDs. Even then you're unlikely to notice the difference.
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  5. #5
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    Quote Originally Posted by Gothmoth View Post
    who told you it is a conspiracy?

    you could think a bit of the money goes into better PCB and signal integrity for OC boards like the crosshair.
    not just water pump connections, fan headers, rgb lighting and stuff.
    Better PCB means more complex PCB. PCI-E 4 signal on better but more complicated and rich PCB may have issues since none of those components were thought for PCI-E 4.0 signal. Cheaper MB have simple and poor PCB, which means less issues for the new signals.

  6. #6
    ROG Guru: Yellow Belt Array xeizo PC Specs
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    At least Crosshair has 4.0 for M. 2 which can be used right now. No graphics cards has the need for better than 3.0 x16 right now, not even 2080Ti. Even 3.0 x8 won't bottleneck a 1080Ti.

  7. #7
    ROG Guru: Blue Belt Array gupsterg PC Specs
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    Anandtech story seems to say this will go.

    https://www.anandtech.com/show/14639...-series-boards

    Currently C7H is on AGESA ComboPi-AM4 1.0.0.2, probably when updated feature will go. I know where some of the Gigabyte boards had newer AGESA than what ASUS boards for this context are on, feature went.
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  8. #8
    ROG Guru: White Belt Array bigtop1967 PC Specs
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    AMD did make some kind of statement about it and that it would be disabled in the future. However, we already know that NVMe drives work well in the pcie 4 slot on the CH7.

    Partly they're (probably) doing this because it's tech support nightmare. It just won't work on some boards. I've read some of the pcie tech docs which state that under certain circumstances, ver 4.0 could run on 3.0 hardware, but with some limitations, most notable distance from cpu and signal paths that don't receive to much interference.

    So if it gets disabled, I think the main reason will be to sell x570, then to prevent too many tech support requests.

    Now we know it works on our board, I think they would be idiots to remove the functionality from us. We need to tell them this!

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