|Architecture and classification|
|Min. feature size||7 nm|
|Instruction set||ARMv8.2-A with SVE and SBBA level 3|
The A64FX is an ARM architecture microprocessor designed by Fujitsu. The processor is replacing the SPARC64 V as Fujitsu's processor for supercomputer applications. It is powering the Fugaku supercomputer.
Fujitsu collaborated with ARM to develop the processor; it will be the first processor to use the ARMv8.2-A Scalable Vector Extension SIMD instruction set with 512-bit vector implementation. A prototype computer using the processors was ranked as the 159th fastest computer in the world on the Top 500 list in November 2019.
The processor uses 32 gigabytes of HBM2 memory with a bandwidth of 1 TB per second. The processor contains 16 PCI Express generation 3 lanes to connect to accelerators, e.g. GPGPUs and FPGAs. The reported transistor count is about 8.7 billion.
Fujitsu designed the A64FX for the Fugaku. As of June 2020 the Fugaku is the fastest supercomputer in the world by TOP500 rankings. Fujitsu intends to sell smaller machines with A64FX processors. Anandtech reported in June 2020 that the cost of a PRIMEHPC FX700 server, with 2 A64FX nodes, was ¥4,155,330 (c. US$39,000).
Cray is developing supercomputers using the A64FX. The Isambard 2 supercomputer is being built for a consortium in the United Kingdom, led by the University of Bristol and also including the Met Office, using the Fujitsu processors. It is an upgrade to the Isambard supercomputer which was built with the Cavium ThunderX2, another ARM architecture microprocessor.
- Comparison of ARMv8-A cores
- SPARC64 V
- ThunderX2 - another ARM architecture high performance computing microprocessor
- Huawei Kunpeng 920 - also an ARM high-performance microprocessor, but developed by the Huawei-owned HiSilicon. Only available in China.
- "Hot Chips 30 conference; Fujitsu briefing" (PDF). Toshio Yoshida.
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- https://www.top500.org/system/179807/ SUPERCOMPUTER FUGAKU - SUPERCOMPUTER FUGAKU, A64FX 48C 2.2GHZ, TOFU INTERCONNECT D
- Cutress, Dr Ian (26 June 2020). "HPC Systems Special Offer: Two A64FX Nodes in a 2U for $40k". www.anandtech.com. Retrieved 28 June 2020.
- "Cray, Fujitsu Both Bringing Fujitsu A64FX-based Supercomputers to Market in 2020". HPCwire. 13 November 2019. Retrieved 8 March 2020.
- Bristol, University of. "February: GW4 Isambard - News and features - University of Bristol". www.bristol.ac.uk. Retrieved 8 March 2020.
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