![]() It's built on the 6 nm (TSMC N6) node, which is a big leap from the GlobalFoundries 12 nm node that the cIOD of Ryzen 5000 series processors were made on. The cIOD (client I/O die) sees a big chunk of innovation. The transistor-count of the "Zen 4" CCD is 6.57 billion, a whopping 58 percent increase from that of the "Zen 3" CCD and its 4.15 billion transistor-count. The CCD measures 70 mm², in comparison to the 83 mm² "Zen 3" CCD. The Zen 4 CCD is slightly smaller than the Zen 3 CCD despite the higher transistor-counts, thanks to the switch to 5 nm (TSMC N5 process). The L1 branch target buffer (BTB) has increased in size from 1 KB to 1.5 KB. The reorder buffer (ROB) in the dispatch stage has been enlarged from 256 entries to 320 entries. Latency of the shared 元 cache is also up, from 46 cycles to 50 cycles. The enlargement of the L2 cache has slightly increased latency, from 12 cycles to 14. The L1I and L1D caches remain 32 KB in size, each while the L2 cache has doubled in size. As AMD's Mark Papermaster revealed in the Ryzen 7000 launch event, the company has enlarged the micro-op cache of the core from 4 K entries to 6.75 K entries. A quarter of the core's die-area is also taken up by the 1 MB dedicated L2 cache.Ĭhiakokhua (aka Retired Engineer) posted a table detailing the various caches and their latencies, comparing it with those of the "Zen 3" core. "Skyjuice" presented the first annotation of the "Zen 4" core, revealing its large branch-prediction unit, enlarged micro-op cache, TLB, load/store unit, and dual-pumped 256-bit FPU that enables AVX-512 support. As we await technical documents from AMD detailing its new "Zen 4" microarchitecture, particularly the all-important CPU core Front-End and Branch Prediction units that have contributed two-thirds of the 13% IPC gain over the previous-generation "Zen 3" core, the tech enthusiast community is already decoding images from the Ryzen 7000 series launch presentation. ![]()
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