The cache system has also been redesigned, making the L1 cache write-back. SMT has been introduced, allowing each core to run two threads. Zen-based processors use a 14 nm FinFET process, are reportedly more energy efficient, and can execute significantly more instructions per cycle. Zen is a clean sheet design that differs from AMD's previous long-standing Bulldozer architecture. The first Zen-based CPUs, codenamed "Summit Ridge", reached the market in early March 2017, Zen-derived Epyc server processors launched in June 2017 and Zen-based APUs arrived in November 2017. The first Zen-based preview system was demonstrated at E3 2016, and first substantially detailed at an event hosted a block away from the Intel Developer Forum 2016.
It was first used with their Ryzen series of CPUs in February 2017. Zen is the codename for the first iteration in a family of computer processor microarchitectures of the same name from AMD.
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