<story><title>AMD’s Zen 4, Part 3: System Level Stuff, and iGPU</title><url>https://chipsandcheese.com/2023/01/05/amds-zen-4-part-3-system-level-stuff-and-igpu/</url></story><parent_chain></parent_chain><comment><author>jagrsw</author><text>&lt;p&gt;&lt;pre&gt;&lt;code&gt;  5950X hit its highest clocks on cores 1 and 4. Both are located on the first CCD. My 3950X clocked highest on cores 4 and 5. Both are also on the first CCD. This is a curious pattern. Perhaps AMD is only binning one CCD to hit the maximum boost clocks on 16 core parts.
&lt;/code&gt;&lt;/pre&gt;
I have 5950X and saw this pattern, the fastest cores are though 2nd and 6th (starting from 0). I don&amp;#x27;t remember exact values from testing (with stress-ng and openssl speed), but it was something similar to what authors observed in their testing. Those two cores were able to reach speeds of around 4.97, the next ones 4.95 or so, with the slowest pair stuck at around 4.7GHz.</text></comment>
<story><title>AMD’s Zen 4, Part 3: System Level Stuff, and iGPU</title><url>https://chipsandcheese.com/2023/01/05/amds-zen-4-part-3-system-level-stuff-and-igpu/</url></story><parent_chain></parent_chain><comment><author>voxadam</author><text>Part 1: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=33477119&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=33477119&lt;/a&gt;&lt;p&gt;Part 2: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=33518751&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=33518751&lt;/a&gt;</text></comment>