3 Replies Latest reply on Sep 23, 2018 2:25 PM by elstaci

    Only 4 Core disable option Ryzen Master for Threadripper 1920x?

    optical10

      I need to get down to 4 cores from 12 for an old game, Dirt Rally, but i'm only seeing 0 or 4 option in "Creator Mode" profile 1 & 2 "Cores Disabled" option clickable section!

       

      Game Mode seems even more restrictive with no "Cores Disabled" clickable option so I'm stuck with the minimum 6 cores it defaults too when I need to drop another two down to 4 cores max.

       

      Is this a 1920x thing as Ryzen 7 vids show more options on the "Cores Disabled"   section & more Profiles too?

        • Re: Only 4 Core disable option Ryzen Master for Threadripper 1920x?
          elstaci

          This Tech website Review of the Ryzen 1920X mentions two Modes for the CPU - Creator's and Game mode. It even mentions about playing the game Dirt and how to get it to play with your cpu: AMD’s Solution to Dual Dies: Creator Mode and Game Mode - The AMD Ryzen Threadripper 1950X and 1920X Review: CPUs on Ste…

           

          Looks like you need to put your Ryzen 1920X in GAME MODE and not Creator's which maximizes all cores of the CPU.

           

          Copied from above link:

          Creator Mode and Game Mode

          *This page was updated on 8/17. A subsequent article with new information has been posted.

          Due to the difference in memory latency between the two pairs of memory channels, AMD is implementing a ‘mode’ strategy for users to select depending on their workflow. The two modes are called Creator Mode (default), and Game Mode, and control two switches in order to adjust the performance of the system.

          The two switches are:

                  Legacy Compatibility Mode, on or off (off by default)

          • Memory Mode: A vs NUMA (A by default)

          The first switch disables the cores in one fo the silicon dies, but retains access to the DRAM channels and PCIe lanes. When the LCM switch is off, each core can handle two threads and the 16-core chip now has a total of 32 threads. When enabled, the system cuts half the cores, leaving 8 cores and 16 threads. This switch is primarily for compatibility purposes, as certain games (like DiRT) cannot work with more than 20 threads in a system. By reducing the total number of threads, these programs will be able to run. Turning the cores in one die off also alleviates some potential pressure in the core microarchitecture for cross communication.The second switch, Memory Mode, puts the system into a unified memory architecture (UMA) or a non-unified memory architecture (NUMA) mode. Under the default setting, unified, the memory and CPU cores are seen as one massive block to the system, with maximum bandwidth and an average latency between the two. This makes it simple for code to understand, although the actual latency for a single instruction will be a good +20% faster or slower than the average, depending on which memory bank it is coming from.

           

          NUMA still gives the system the full memory, but splits the memory and cores into into two NUMA banks depending on which pair of memory channels is nearest the core that needs the memory. The system will keep the data for a core as near to it as possible, giving the lowest latency. For a single core, that means it will fill up the memory nearest to it first at half the total bandwidth but a low latency, then the other half of the memory at the same half bandwidth at a higher latency. This mode is designed for latency sensitive workloads that rely on the lower latency removing a bottleneck in the workflow. For some code this matters, as well as some games – low latency can affect averages or 99th percentiles for game benchmarks.The confusing thing about this switch is that AMD is calling it ‘Memory Access Mode’ in their documents, and labeling the two options as Local and Distributed. This is easier to understand than the SMT switch, in that the Local setting focuses on the latency local to the core (NUMA), and the Distributed setting focuses on the bandwidth to the core (UMA), with Distributed being default.

          • When Memory Access Mode is Local, NUMA is enabled (Latency)
          • When Memory Access Mode is Distributed, UMA is enabled (Bandwidth, default)

          So with that in mind, there are four ways to arrange these two switches. AMD has given two of these configurations specific names to help users depending on how they use their system: Creator Mode is designed to give as many threads as possible and as much memory bandwidth as possible. Game Mode is designed to optimize for latency and compatibility, to drive game frame rates.

          AMD Threadripper Options
          Words That Make Sensemarketing game
          Ryzen
          Master
          Profile
          Two Dies or
          One Die
          Memory
          Mode
          Legacy
          Compatibility
          Mode
          Memory
          Access
          Mode
          Creator ModeTwoANOffDistributed
          -TwoINOffLocal
          -OneANOnDistributed
          Game ModeOneINOnLocal

          There are two ways to select these modes, although this is also a confusing element to this situation.The way I would normally adjust these settings is through the BIOS, however the BIOS settings do not explicitly state ‘Creator Mode’ and ‘Game Mode’. They should give immediate access for the Memory Mode, where ASUS has used the Memory Access naming for Local and Distributed, not NUMA and UMA.  For the Legacy Compatibility Mode, users will have to dive several screens down into the Zen options and manually switch off eight of the cores, if the setting is going to end up being visible to the user. This makes Ryzen Master the easiest way to implement Game Mode.While we were testing Threadripper, AMD updated Ryzen Master several times to account for the latest updates, so chances are that by the time you are reading this, things might have changed again. But the crux is that Creator Mode and Game Mode are not separate settings here either. Instead, AMD is labelling these as ‘profiles’. Users can select the Creator Mode profile or the Game Mode profile, and within those profiles, the two switches mentioned above (labelled as Legacy Compatibility Mode and Memory Access Mode) will be switched as required.

          Cache Performance

          As an academic exercise, Creator Mode and Game Mode make sense depending on the workflow. If you don’t need the threads and want the latency bump, Game Mode is for you. The perhaps odd thing about this is that Threadripper is aimed at highly threaded workloads more than gaming, and so losing half the threads in Game Mode might actually be a detriment to a workstation implementation.  That being said, users can leave SMT on and still change the memory access mode on its own, although AMD is really focusing more on the Creator and Game mode specifically.For this review, we tested both Creator (default) and Game modes on the 16-core Threadripper 1950X. As an academic exercise we looked into memory latency in both modes, as well as at higher DRAM frequencies. These latency numbers take the results for the core selected (we chose core 2 in each case) and then stride through to hit L1, L2, L3 and main memory. For UMA systems like in Creator Mode, main memory will be an average between the near and far memory results. We’ve also added in here a Ryzen 5 1600X as an example of a single Zeppelin die, and a 6950X Broadwell for comparison. All CPUs were run at DDR4-2400, which is the maximum supported at two DIMMs per channel. For the 1950X in the two modes, the results are essentially equal until we hit 8MB, which is the L3 cache limit per CCX. After this, the core bounces out to main memory, where the Game mode sits around 79ns while the Creator mode is at 108 ns. By comparison the Ryzen 5 1600X seems to have a lower latency at 8MB (20ns vs 41 ns), and then sits between the Creator and Game modes at 87 ns. It would appear that the bigger downside of Creator mode in this way is the fact that main memory accesses are much slower than normal Ryzen or in Game mode.If we crank up the DRAM frequency to DDR4-3200 for the Threadripper 1950X, the numbers change a fair bit:
          Click for larger image
          Up until the 8MB boundary where L3 hits main memory, everything is pretty much equal. At 8MB however, the latency at DDR4-2400 is 41ns compared to 18ns at DDR4-3200. Then out into full main memory sees a pattern: Creator mode at DDR4-3200 is close to Game Mode at DDR4-2400 (87ns vs 79ns), but taking Game mode to DDR4-3200 drops the latency down to 65ns.Another element we tested while in Game Mode was the latency for near memory and far memory as seen from a single core. Remember this slide from In our testing, we achieved the following:

          • At DDR4-2400, 79ns near memory and 136ns far memory (108ns average)
          • At DDR4-3200, 65ns near memory and 108ns far memory (87ns average)

          Those average numbers are what we get for Creator mode by default, indicating that the UMA mode in Creator mode will just use memory at random between the two

          1 of 1 people found this helpful
            • Re: Only 4 Core disable option Ryzen Master for Threadripper 1920x?
              optical10

              Okay thanks, I did read the article and that really caused the confusion even before I asked the question as you can see in their diagram of the program that are more options then I currently have for disabling cause and for setting up profiles so I think what's happening is that they have actually changed the program since the article was written or the version of Windows that I had installed which was a Windows 10 inside a preview which will be officially released next month was causing some issues. Also I seem to have some AMD gigabyte motherboard issues with this brand-new motherboard the X399 Extreme so rolling back to a previous Windows version seems to have helped.

              Anyway after rolling back one of the updates that particular preview version of Windows I am now currently able to run Dirt Rally once again even in creators mode when in fact it should only be executable in game mode by disabling 50% of the cause from 12 down to 6. Also since the article may be cold masters have optimised the game even for thread ripper CPUs.

              I still would like to hear from somebody with A 1920x threadripper who has the option of disabling more cores than the six as the only option and has more than two profile options available just like in the picture in that article you linked to.

                • Re: Only 4 Core disable option Ryzen Master for Threadripper 1920x?
                  elstaci

                  AMD doesn't support official drivers for Preview Windows. Only official versions of Windows.

                   

                  If you are still using a Preview version, might be the reason why Ryzen Master is not showing what you need.

                   

                  Anyway, at least you got your game going and that is what is important.

                   

                  Just guessing, but could the Ryzen CPU/APU have been engineered to only disable a certain amount of cores. Maybe if you disable too many cores it might cause some instability issues in the CPU/APU.