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Concept
Power10
Summary
Power10 is a superscalar, multithreading, multi-core microprocessor family, based on the open source Power ISA, and announced in August 2020 at the Hot Chips conference; systems with Power10 CPUs. Generally available from September 2021 in the IBM Power10 Enterprise E1080 server.
The processor is designed to have 15 cores available, but a spare core will be included during manufacture to cost-effectively allow for yield issues.
Power10-based processors will be manufactured by Samsung using a 7 nm process with 18 layers of metal and 18 billion transistors on a 602 mm2 silicon die.
The main features of Power10 are higher performance per watt and better memory and I/O architectures, with a focus on artificial intelligence (AI) workloads.
Each Power10 core has doubled up on most functional units compared to its predecessor POWER9. The core is eight-way multithreaded (SMT8) and has 48 KB instruction and 32 KB data L1 caches, a 2 MB large L2 cache and a very large translation lookaside buffer (TLB) with 4096 entries. Latency cycles to the different cache stages and TLB has been reduced significantly. Each core has eight execution slices each with one floating-point unit (FPU), arithmetic logic unit (ALU), branch predictor, load–store unit and SIMD-engine, able to be fed 128-bit (64+64) instructions from the new prefix/fuse instructions of the Power ISA v.3.1. Each execution slice can handle 20 instructions each, backed up by a shared 512-entry instruction table, and fed to 128-entry-wide (64 single-threaded) load queue and 80-entry (40 single-threaded) wide store queue. Better branch prediction features have doubled the accuracy. A core has four matrix math assist (MMA) engines, for better handling of SIMD code, especially for matrix multiplication instructions where AI inference workloads have a 20-fold performance increase.
The processor has two "hemispheres" with eight cores each, sharing a 64 MB L3 cache for a total of 16 cores and 128 MB L3 caches.
Official source
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