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Intel Xe Graphics' Incredible Performance Uplift From OpenCL To oneAPI Level Zero To Vulkan

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  • #31
    Originally posted by bug77 View Post
    Ahem, this is a Tiger Lake CPU you're looking at.
    It's 10nm with some patches for vulnerabilities. It's still otherwise a pretty old architecture.

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    • #32
      Originally posted by mikkl View Post


      Xe is a lot better than Vega, even the 80 EUs version of Xe LP at 1300 Mhz easily beats Vega 8 running at 1750 Mhz. Vega in Renoir runs much higher clocked and loses. Another factor is that Vega has been optimized and tweaked for years and Xe is fresh new which means Xe has a disadvantage at the moment which will disappear more and more in the upcoming months.
      Vega is also last-gen architecture, but the only thing that matters is actual performance.

      Renoir/Vega in a 4800U consistently outperforms Tigerlake/Xe when running at 15W. The amount ranges from a very small amount, to a pretty large one depending on the benchmark you're looking at.

      Bump the Tigerlake CPU up to 28W and it takes the lead, but it's also using more power.
      smitty3268
      Senior Member
      Last edited by smitty3268; 25 October 2020, 05:18 AM.

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      • #33
        Originally posted by smitty3268 View Post

        Vega is also last-gen architecture, but the only thing that matters is actual performance.

        Renoir/Vega in a 4800U consistently outperforms Tigerlake/Xe when running at 15W. The amount ranges from a very small amount, to a pretty large one depending on the benchmark you're looking at.

        Bump the Tigerlake CPU up to 28W and it takes the lead, but it's also using more power.

        Not in this test: https://www.pcworld.com/article/3575...e-preview.html

        And also this is meaningless in regards to Xe LP because it's a package power and not GPU power and furthermore Renoir is manufactured on a better GPU process. Xe LP is a lot stronger than Vega 8, Vega 8 needs a 50% higher clock speed and still loses.

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        • #34
          Interesting, and a useful contribution to this discussion. I think the tests I saw had the Renoir less power constrained which to be fair is probably overestimating it. However, note that the Xe is only about 10-30% faster in those tests. That's a decent lead, but it's not crushing Renoir like you might think if all you've seen is the marketing information coming out of Intel. It's basically the same type of lead that Renoir held over Ice Lake before this.

          Originally posted by mikkl View Post
          Renoir is manufactured on a better GPU process
          The only thing that matters is the final performance. If Intel wanted to use TSMC, they could - they deliberately chose not to, and their final product should be judged for what it is, not what it theoretically could be in some alternate world.

          Vega 8 needs a 50% higher clock speed
          You say that like it's a negative, but it's a massive positive that it's able to be clocked higher.
          smitty3268
          Senior Member
          Last edited by smitty3268; 26 October 2020, 12:04 AM.

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          • #35
            Originally posted by smitty3268 View Post
            You say that like it's a negative, but it's a massive positive that it's able to be clocked higher.

            It is negative in various ways because it means Intel has a much stronger GPU, per clock it is much faster which is a good thing in the longer term. Intel has a much bigger headroom for future clock speed improvements than AMD. For Intel it would be way worse if it was the other way around. Keep in mind AMD didn't clock their iGPUs that high until the Renoir generation. So with ADL-P (Xe LP 96 EUs) they can work on clock speed improvements without adding more units. Also keep in mind iGPUs are bandwidth limited, you cannot expect Intel to be 80-90% faster on DDR4/LPDDR4, this is unrealistic. Generally the faster iGPU has bigger bandwith constraints. Next year Tigerlake with LPDDR5 support is coming by the way.

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            • #36
              Originally posted by mikkl View Post
              It is negative in various ways because it means Intel has a much stronger GPU, per clock it is much faster which is a good thing in the longer term. Intel has a much bigger headroom for future clock speed improvements than AMD.
              What longer term? Vega is dead, and Intel will be competing against a new architecture in a few months.

              In the here and now, all that matters is what they currently do. If Intel was able to run their gpu any faster while still hitting their various power, cost, etc. goals then they would. Slower isn't better.

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