_:n6c8e065ec45c43b6bfab09e245732ccexb18
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"I think it was Hardware Unboxed who did the testing which showed that Renoir in the Zephyrus G14 even with the integrated IMC does much worse in terms of latency than Skylake at 3200 Mhz vs 2666 Mhz(most probably). Doesn't it run 1:1 at 3200 MHz? If so there is a significant drawback to Ryzen's memory controller design compared to Intel.\n\nThere is no doubt that memory subsystem on Ryzen is a bottleneck and no FCLK improvement alone can remove it entirely. As seen in the video even custom timings the difference was 60ns vs 38.6ns so about 35% worse. To me the Renoir results weren't that surprising as the chiplet design shouldn't add more than ~5ns to the latency.\n\nI took it as a given that the unified cache( 32MB vs 2x16MB) will be a big boon for Zen 3 as well as other improvements in the core (hopefully non-statically partitioned uop cache, larger L1D cache, 1MB L2 cache, inclusive L3 along with the huge CCX redesign).\nI still can't see them getting rid of a limiting overall fabric clock, so my point was that even with all those upcoming improvements they still probably:\n\n1. Still have to improve the FCLK significantly (>= 2.1GHz)\n2. Make it possible for average-joe to recieve these FCLK improvements with minimal fuss (Ideally just by turning on your computer with a correct AMP module).\n\nIMO not implementing AMP (despite mentioning it as an option in an interview) would be a huge missed opportunity. Just look at the difference between 3200 XMP vs the custom timings in the video. Imagine if Zen 3 had some 4200-4400Mhz low-latency AMP modules in the review kit running at 1:1 (asked to be included along with stock results)."
<https://forums.anandtech.com/threads/video-ryzen-7-3800x-5ghz-vs-core-i9-9900k-5-ghz.2580198/>