AMD’s Zen 3 architecture is expected to deliver an 8% IPC boost

AMD's Zen 3 architecture is expected to deliver an 8% IPC boost

AMD’s Zen 3 architecture is expected to deliver an 8% IPC boost

10 days ago, were were one of of the first websites to report on AMD’s Zen 3 architecture and the radically redesigned aspects of the company’s next-generation processor designs. Let’s be clear about this again; this information isn’t a mere rumour. Tt came from an AMD representative, Martin Hilgeman, and from an official AMD presentation at the HPC AI Advisory Council’s 2019 UK Conference. AMD may not want this information in the public domain, but that doesn’t mean it isn’t there. 

Now, a new report has claimed that AMD’s next-generation Zen 3 architecture will deliver an 8% IPC boost over Zen 2 alongside a 100-200MHz boost in clock speeds. When combined, this will provide a single-threaded performance boost of over 10% across many workloads. Even so, it must be remembered that IPC boosts are always application-specific. Even if 8% is AMD’s average IPC boost for their next-gen architecture, Zen 3 could offer much larger, or lower, performance boosts in specific workloads. These IPC boost claims are little more than a rumour at this time. 

As we have said previously, AMD’s Zen 3 architecture fundamentally changes the core topology of AMD’s 8-core Zen CPU dies. Instead of relying on quad-core CCX’s in each 8-core CPU die, Zen 3 appears to be moving to a unified core design that keeps all eight CPU cores within a single group on each die. This allows AMD to combine each chip’s split L3 caches into a singular unit, granting each core direct access to a larger bank of L3 cache. 

This design change will decrease many of the internal latencies of each of AMD’s Zen 3 CPU dies. This design shift potentially accounts for some of AMD’s IPC boost in specific workloads. AMD’s slides also hint at an increase in L3 cache size, which could lead to further performance gains. While this change will not impact the latencies between separate CPU dies, this reduction in internal latencies will have enormous implications for many workloads, especially in consumer-systems that use single 8-core Zen CPU dies. 

PC gamers should also see this potential reduction in CPU latencies and increase in cache size as a good thing, given how AMD’s improved L3 Cache design/ “GameCache” boosts Zen 2’s gaming performance. 

AMD reveals early Zen 3/Milan architecture details and Zen 4/Genoa plans  

While 7nm isn’t expected to offer insane performance/efficiency improvements as AMD’s previous node shift, it looks like AMD plans to make Zen 3 another substantial release thanks to smart processor design and refinements that target many of Zen’s current shortcomings. 

Given what AMD has shown us regarding Zen 3, we find it easy to believe that AMD has an 8% IPC boost in store for us. The question now is how long will it take for Zen 3 to come to market, and whether or not AMD can deliver much of a clock speed boost over Zen 2. While AMD has confirmed that Zen 3 designs complete, it remains too early to know anything definitive about core clock speeds, as these are decided very late in a processor’s development cycle.  

You can join the discussion on AMD’s Zen 3 core design and rumoured IPC boost on the OC3D Forums.