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> Strangely, the game sees a 5% performance loss with the loop buffer disabled when pinned to the non-VCache die. I have no explanation for this, […] With more

• eek2121 2y ago
  He didn’t provide enough detail here. The second CCD on a Ryzen chip is not as well binned as the first one even on. non-X3D chips. Also, EVERY chip is different. Most of the cores on CCD0 of my non-X3D chip hit 5.6-5.75ghz. CCD 1 has cores topping out at 5.4-5.5ghz. V-Cache chips for Zen 4 have a huge clock penalty, however the Cache more than makes up for it. Did he test CCD1 on the same chip with both the feature disabled and enabled? Did he attempt to isolate other changes like security fixes as well? He admitted “no” in his article. The only proper way to test would be to find a way to disable the feature on a bios that has it enabled and test both scenarios across the same chip, and even then the result may still not be accurate due to other possible branch conditions. A full performance profile could bring accuracy, but I suspect only an AMD engineer could do that…
  • clamchowder 2y ago
    Yes, I tested on CCD1 (the non-vcache CCD) on both BIOS versions.
• ryao 2y ago
  He mentioned that it was disabled somewhere between the two UEFI versions he tested. Presumably there are other changes included, so his measurements are not strict A/B testing.