At the ISSCC 2020 conference, Big Blue IBM announced the processor improvements of the new-generation mainframe Z15. Although the GF 14nm process is still used, the Z15 processor has changed quite a bit, and still achieved the miracle of 12-core 5.2GHz.
We have introduced the basic situation of this processor before. The core area is as high as 696mm2 (about 3-4 times that of an ordinary desktop 8-core processor), it integrates 9.2 billion transistors, the frequency is 5.2GHz, and each core is equipped with 128KB L1 data cache, 128KB L1 instruction cache, 4+4MB L2 eDRAM cache and 256MB L3 cache.
The Japanese PCWatch website recently disclosed IBM’s paper, revealing some differences between the Z15 processor and the Z14 processor in more detail.
According to IBM’s information, their target improvements on the Z15 processor include a number of aspects, starting with a 10% increase in single-core performance, a 20% increase in the number of multi-cores (from 10 cores to 12 cores), a 33% increase in L2 cache, and a 33% increase in L3 cache. times, the L4 cache has increased by 43%, all of which are to be achieved under the same 14nm SOI process.
Generally speaking, if the process is not upgraded, it is impossible to improve single-core and multi-core performance at the same time and greatly increase the cache capacity, but IBM did it, and it exceeded expectations.
In the end, IBM not only added 2 cores to the Z15 processor, but also the ST single-core performance increased by 14%, exceeding the predetermined target of 10%, the L2/L3/L4 cache and other designs also reached the target, and the power consumption increased Also minimal.
In a word, IBM has achieved the goal beyond expectations on the Z15 processor. The single-core, multi-core and cache systems have been greatly improved under the same process, and the core area is 696mm2, and the increase in power consumption is also very limited. This God optimization technology definitely makes other companies. envious.
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