… Zen 4 in a high performance mobile implementation shows similar split lock latency to Zen 2. Arrow Lake E-Cores have a lot of monitoring sophistication around bus locks. Under the split lock core to core latency test, any E-Core involved gets blocked for nearly all cycles. …
… Individual scores in the integer suite show Zen 5 and Lion Cove closely matched, as the aggregate scores would suggest. Absolute scores show just how far outmatched the Ampere eMAG system is. Current desktop cores obliterate ones in the Ampere eMAG, especially in 706.stockfish. …
… It has more reordering capacity than AMD’s Zen 5, and L2 capacity comparable to that of Intel’s recent P-Cores. Unlike Arm’s 7-series cores, X925 makes few concessions to reduce power and area. It’s a core designed through and through to maximize performance. …
… Many workloads average well beyond 2 IPC on high performance cores like Intel’s Lion Cove and AMD’s Zen 5. Skymont isn’t explicitly a high performance core, but can often get close in IPC terms. …
… At approximately 165mm 2 per CCD, that would make a Zen 6 core plus the 4MB of L3 per core about 5mm 2 each which is similar to Zen 5’s approximately 5.34mm 2 on N3 when counting both the Zen 5 core and 4MB of L3 cache. …
… From Zen 4 onward, AMD’s L3 performance monitoring unit PMU can measure average latency in nanoseconds for requests external to the core cluster. PMU data isn’t directly comparable to software measurements, because it only accounts for latency after the point of a L3 miss. …
… Single core DRAM bandwidth is also higher from a X925 core, at 38 GB/s compared to 26 GB/s from an A725 core. A single AMD Zen 5 or Zen 4 core can pull over 50 GB/s from DRAM, or well north of 100 GB/s from L3. …
… Crestmont presents a more difficult comparison because of different executed instruction counts. 548.exchange2 executed 1.93 trillion instructions on the x86-64 cores, but required 2.12 trillion on aarch64 cores. …
… AMD’s Strix Halo can be equipped with dual 8 core Zen 5 CCDs for a total of 16 cores that feature the same 512b FPU as the desktop parts. This is a change from the more mainstream and monolithic Strix Point APU which has “double-pumped” 256b FPUs similar to Zen 4 for use with AVX512 code. …
… CPU core clusters come next. Each octa-core Zen 5 Core Complex CCX connects to Infinity Fabric via one endpoint. …