There is no doubt that the Kirin 9000e. First of all, the 9000e is a five-nanometer process, and the 990 is made of seven nanometers, both of which are very different. The performance of the Kirin 9000E processor is equivalent to that of the Qualcomm Snapdragon 875.
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The Kirin 990 processor has the same performance as the Qualcomm Snapdragon 855 processor.
990 is 7nm, 9000e is the latest 5nm, there is still a gap, but it does not affect normal use