<story><title>A Look at the AMD Zen 2 Core</title><url>https://fuse.wikichip.org/news/2458/a-look-at-the-amd-zen-2-core/</url></story><parent_chain><item><author>garkin</author><text>Zen 2 is very good in number crunching and synthetics. But it has a problem - terrible memory latency. 70ns with 3600cl16. (&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18168279&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18168279&lt;/a&gt;) It distills to a not-so-good gaming frame times. It&amp;#x27;s 64mb L3 cache (&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikichip.org&amp;#x2F;wiki&amp;#x2F;amd&amp;#x2F;ryzen_9&amp;#x2F;3900x&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikichip.org&amp;#x2F;wiki&amp;#x2F;amd&amp;#x2F;ryzen_9&amp;#x2F;3900x&lt;/a&gt;) helps only partially.&lt;p&gt;Few games will suffer greatly from it, but there are several titles with RAM bottlenecks, like PUBG and FarCry.&lt;p&gt;Anyway, AMD has a much better price&amp;#x2F;performance offer than Intel. For general puprose Intel is totaly anihilated, but for the games they are still more than competitive.</text></item></parent_chain><comment><author>jchw</author><text>Not sure why your original comment disappeared.&lt;p&gt;I was kind of curious what the latencies might be for other contemporary processors&amp;#x2F;builds, and I&amp;#x27;m not sure 70ns is actually really outside the normal margins.&lt;p&gt;Here&amp;#x27;s an i7-8700k build that is already pretty close to 70ns: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18173216&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18173216&lt;/a&gt; - Also acknowledging that, this is not the &amp;#x27;best case&amp;#x27; performance. But seems to be not so unusual either.&lt;p&gt;(edit: Removed section about latency ladder as I just realized it was caching and not system memory latency that we were most likely seeing initially, and therefore not terribly relevant.)&lt;p&gt;As far as I can tell, Zen 1 has similar latency characteristics[0][1]... so I guess I won&amp;#x27;t notice any degradation when upgrading to Zen 2.&lt;p&gt;[0]: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18173307&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18173307&lt;/a&gt;&lt;p&gt;[1]: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18173240&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18173240&lt;/a&gt;</text></comment>
<story><title>A Look at the AMD Zen 2 Core</title><url>https://fuse.wikichip.org/news/2458/a-look-at-the-amd-zen-2-core/</url></story><parent_chain><item><author>garkin</author><text>Zen 2 is very good in number crunching and synthetics. But it has a problem - terrible memory latency. 70ns with 3600cl16. (&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18168279&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.userbenchmark.com&amp;#x2F;UserRun&amp;#x2F;18168279&lt;/a&gt;) It distills to a not-so-good gaming frame times. It&amp;#x27;s 64mb L3 cache (&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikichip.org&amp;#x2F;wiki&amp;#x2F;amd&amp;#x2F;ryzen_9&amp;#x2F;3900x&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikichip.org&amp;#x2F;wiki&amp;#x2F;amd&amp;#x2F;ryzen_9&amp;#x2F;3900x&lt;/a&gt;) helps only partially.&lt;p&gt;Few games will suffer greatly from it, but there are several titles with RAM bottlenecks, like PUBG and FarCry.&lt;p&gt;Anyway, AMD has a much better price&amp;#x2F;performance offer than Intel. For general puprose Intel is totaly anihilated, but for the games they are still more than competitive.</text></item></parent_chain><comment><author>demilicious</author><text>As far as I know, these processors are not yet released. What&amp;#x27;s the confidence level that this user benchmark will be indicative of real life expected performance?&lt;p&gt;It seems implausible that this user benchmark is a good indicator. The Zen 1 architecture exhibited nothing of the sort[0] -- it would be an order of magnitude performance regression.&lt;p&gt;I expect we&amp;#x27;ll start to see more accurate tests once the processors are actually released into the wild.&lt;p&gt;[0]&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.tomshardware.com&amp;#x2F;reviews&amp;#x2F;amd-ryzen-7-2700x-review,5571-3.html&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.tomshardware.com&amp;#x2F;reviews&amp;#x2F;amd-ryzen-7-2700x-revie...&lt;/a&gt;</text></comment>