Arm replaces CPU and GPU flagships, and more

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By Steve Bush - from electronicsweekly, May. 26, 2020 – 

Offered as part of Arm's custom programme, Cortex-X1 is the most powerful Cortex processor yet, according to the company, with 30% greater peak performance over the current Cortex-A77 CPU, as well as 22% single-thread integer performance improvements over the just-announced Cortex-A78.

"This short high-performance burst is best for reactivity and responsiveness when using devices, enabling the highest performance ever for smartphones and large screen devices," said Arm. "Furthermore, Cortex-X1 offers 2x machine learning performance improvements over Cortex-A77. This is part of our wider push for more local compute performance." (see diagram right - note memory differences)

Cortex-A78 is tweaked for efficiency: "unquestionably our most efficient Cortex-A CPU ever designed for mobile", according to the company. It has the same architecture as Cortex-A77, with modified micro-architecture to increase performance/W and performance/area. "We have maximized efficiency through reducing structures that have low performance and area, such as on the L1-I and L1-D caches," said Arm. "We have then optimised existing structures to consume less power, such as the brand prediction structures. This leads to 4% less power and 5% less area."

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