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Radeon RX 5600 XT With New vBIOS Offering Better Linux Performance Following Fix

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  • #21
    Originally posted by atomsymbol View Post
    You moved to talking about 4&8 GB GPUs, while the discussion was about 12+ GB.
    No. I talked about what would change if the 5600 XT were to get a 12 GB variant. And that would likely just be double capacity memory chips, like in the 5500 XT 4/8 GB.

    Originally posted by atomsymbol View Post
    It would be helpful if you could find out how the power consumption of Samsung's K4Z80325BC-HC14 (256M x 32) compares to the power consumption of K4ZAF325BM-HC14 (512M x 32).
    I thought it was common knowledge that the number of DRAM chips, not their capacity, is what is mainly driving power consumption.

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    • #22
      Originally posted by chithanh View Post
      No. I talked about what would change if the 5600 XT were to get a 12 GB variant. And that would likely just be double capacity memory chips, like in the 5500 XT 4/8 GB.

      I thought it was common knowledge that the number of DRAM chips, not their capacity, is what is mainly driving power consumption.
      According to Figure 6 in https://www.drdobbs.com/the-problem-...5800830?pgno=2, the power consumption of DDR3-1600 RDIMM increases by 10% when density goes from 1Gb to 2Gb (from 5 Watts to 5.5 Watts).

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      • #23
        Originally posted by chithanh View Post
        No. I talked about what would change if the 5600 XT were to get a 12 GB variant.
        I don't understand. Do you mean that today on all 5600 XT PCBs there already is the extra wire which is needed to address 12 GB of memory?

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        • #24
          So pretty insignificant. Even if we very generously assume +0.5 W per GDDR6 component, that is +3 W for the entire card.

          Numbers that I have come across are ~2.5 W per GDDR6 component, independent of capacity. And it makes sense when you think of it, most of the power consumption happens in the physical interface, not in the DRAM cells. This is also what makes HBM much more energy efficient than GDDR5/5X/6.
          Originally posted by atomsymbol View Post
          I don't understand. Do you mean that today on all 5600 XT PCBs there already is the extra wire which is needed to address 12 GB of memory?
          Not sure what wire you are talking about. Care to point it out on the GDDR6 pinout?

          Last edited by chithanh; 01-26-2020, 07:43 PM.

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          • #25
            Whow, that's a 44% increase in average power consumption for a 5% increase in performance with the new vBIOS. Looks like something is not quite optimized yet.

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            • #26
              I'm looking for information on how to make the 5600 card work on Linux.
              The latest driver pack released by AMD is version 19.50 which adds support for RX 5500. The kernel would also require some modifications.
              At moment, running more than a basic console on this card should be simply impossible.
              How can you not only run X but even test games..???
              Infos on how to make those games run on Linux would also be appreciated...
              Thanks for your answer!

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              • #27
                The next packaged driver release including 5600XT support should be available in a week or so.

                In the meantime, as long as your board does not have the updated VBIOS (which is likely but not definite) then any distro with good Navi10 support should work IIRC.

                Which distro/version are you running ?
                Last edited by bridgman; 01-28-2020, 06:59 AM.

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                • #28
                  Originally posted by bridgman View Post
                  Which distro/version are you running ?
                  I'm running Debian 10 Buster (stable) 64 bit. It may be a bit too "conservative" as of package versions, but i can change to another distro if it's a problem.

                  Thankyou

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                  • #29
                    How does one get a hold of the updated SMC? build mesa from developer tree?

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                    • #30
                      You can grab the new smu ucode here:
                      https://people.freedesktop.org/~agd5...navi10_smc.bin
                      It will be upstreamed to linux-firmware once it's completed our internal QA cycle. You can run the 19.50 packages or upstream code on the RX 5600 boards. If they have the old vbios, they will work fine. If they have the new vbios you can still use them with the old smc ucode, you'll just get slower performance.

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