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Thread: Change PCIE latency on Asrock Z77 Extreme 3




  1. #1
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    Default Change PCIE latency on Asrock Z77 Extreme 3

    I cannot find any way to increase PCIE latency in BIOS on this board. I installed the latest BIOS (1.5).

    I got the following reply from asrock support:
    "Hello,
    There is no option for you to change the PCIE latency."

    To me, this is unacceptable on a board with 2 PCIE 3.0 slots and a PCIE 2.0 slot. Stock PCIE latency (32ns) will not allow you to get maximum performance out of 2, much less 3, GPUs.
    Last edited by MooneyDriver; 03-13-2014 at 02:49 AM.

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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    You must be mining?

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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    Quote Originally Posted by - wardog - View Post
    You must be mining?
    I do mine with this machine, but it is also my primary desktop. It only has two GPUs, so I'm not asking a whole lot of the motherboard. I think it would be a bit more stable if I could increase the PCIE latency a bit, because that worked with my old MSI board.

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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    Never heard of a way to do that, or what would actually be adjusted.

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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    Is there a setting for decreasing the pcie frequency?
    Section 3.4, page 59 in the user's manual doesn't go into detail for the Advanced Screen menu options.

    Which MSI motherboard model had the adjustment? What was the name of this field?
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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    I've seen it on a few boards passing through here.

    Why I asked of mining is some cards can req more data than the timer/bandwidth allows. Seems miners are now looking for this option back as they run multi GPU's.

    From the MSI Z77 MPOWER manual:

    > PCI Latency Timer
    Controls how long each PCI device can hold the bus before another takes over.
    When set to higher values, every PCI device can conduct transactions for a longer
    time and thus improve the effective PCI bandwidth.
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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    And now that I think of it the Asus A8N-E's I used to run also had it as "PEG Link (something or another)" where you could slow or speed up.

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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    @ Mooney

    Does changing the "PCIE 2 Link Speed" and "PCIE 3 Link Speed" to a lower gen gain you any results? Er, assuming that is where your cards reside of course

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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    Quote Originally Posted by - wardog - View Post
    I've seen it on a few boards passing through here.

    Why I asked of mining is some cards can req more data than the timer/bandwidth allows. Seems miners are now looking for this option back as they run multi GPU's.

    From the MSI Z77 MPOWER manual:

    > PCI Latency Timer
    Controls how long each PCI device can hold the bus before another takes over.
    When set to higher values, every PCI device can conduct transactions for a longer
    time and thus improve the effective PCI bandwidth.

    Thank you for that, that's a much better explanation than what I was about to post. I first discovered this option when I wanted to mine with a single discrete GPU and use integrated graphics to drive my display. The integrated GPU was nearly unusable on the MSI board before I increased the PCIE latency.

    When I bought a second GPU I bought this board because it had wider PCIE slot spacing than the old one. The integrated graphics are quite usable, but I have been experiencing some instability which I believe I have narrowed down to the two GPUs monopolizing the PCIE bus. I figured that if this is happening when the miner fully utilizes GPUs, it will likely happen if a game is doing the same. After uninstalling / cleaning / reinstalling all of my drivers and tweaking the miner a bit, the system is quite stable now. I would still like to have the option of adjusting the PCIE latency, especially if I decide to run 3 GPUs in the future.

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    Default Re: Change PCIE latency on Asrock Z77 Extreme 3

    Quote Originally Posted by - wardog - View Post
    @ Mooney

    Does changing the "PCIE 2 Link Speed" and "PCIE 3 Link Speed" to a lower gen gain you any results? Er, assuming that is where your cards reside of course
    I had to drop the link speed to gen2 to make the IGPU driven desktop usable when I am mining on both discrete GPUs. That was the same on the MSI board.

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