Topic summary
Hygon Dhyana
Extracted from the Wikipedia article Epyc.
Chinese variants
A variant created for the Chinese server market by Hygon Information Technology is the Hygon Dhyanasystem on a chip. It is noted to be a variant of the AMD Epyc, and is so similar that "there is little to no differentiation between the chips". It has been noted that there is "less than 200 lines of new kernel code" for Linux kernel support, and that the Dhyana is "mostly a re-branded Zen CPU for the Chinese server market". Later benchmarks showed that certain floating point instructions are performing worse, probably to comply with US export restrictions. AES and other western cryptography algorithms are replaced by Chinese variants throughout the design.