A little more about: Cortex-X4, Arm's most powerful core to date

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The highest single-threaded performance will be , followed by the Cortex-A720 in the middle and the Cortex-A520 at the bottom of the power saving spectrum. They can be mixed and combined into core clusters (example on the right).

“We not only provide the most powerful Arm Cortex CPU through the Cortex-X4, but also present the most powerful Cortex CPU computing cluster ever created,” the company said.

Following Arm's big.little concept, running application software can be switched between these three different processors on the fly to instantly trade power for performance and extend the phones battery life.

Sharing single-threaded and multi-threaded code across core clusters is an IP (intellectual property) unit called DSU-120, which can handle up to 14 cores and has L3 cache options of up to 32MB.

“From a 10x Cortex-X4 and 4x Cortex-A720 CPU cluster for high-performance notebooks to a 1x Cortex-X4, 4x Cortex-A720 and 4x Cortex-A520 cluster for flagship smartphones, the scalable DSU is the cornerstone of Arm's new end-to-end computing solution, the TCS23, ” said.

It also implies an octa-core configuration: one Cortex-X4, five Cortex-A720s and a pair of Cortex-A520s, but any combination is possible.

<p>Compared to the previous generation of telephone cluster cores:

Cortex-X4 is said to have 15% higher performance than X3 (SPECRate2017_int_base for 2MB L2, 8MB L3, 3.4GHz, 100ns latency X4 vs Cortex-X3 in a phone shipping March 2023) and at 40% better power efficiency (corresponds to SPECRate2017_int_base peak performance). , the same X4 and X3)

The Cortex-A720 is said to provide better power efficiency on the 20% compared to the Cortex-A715 (SPECint_base2006, 32KB L1, 512KB L2, 8MB L3 Cortex-A720 vs the same Cortex-A715 cache, same process, same frequency).

The Cortex-A78 remains popular due to its small footprint, Arm said, and the Cortex-A720 can be scaled down to fit this area while increasing performance by 10% ( SPECint_base2006, 32KB L1, 128KB L2, 2MB L3 'optimized area' Cortex -A720 vs 32KB L1, 256KB L2, 2MB L3 Cortex-A78, same process, same frequency).

Cortex -A520 on 22% is more energy efficient than previous Cortex-A510 (SPECint_base2006, 32KB L1, 256KB L2 (shared with second A520), 4MB L3 Cortex-A520 vs 32KB L1, 256KB L2 (shared with second A510), 4 MB L3, year 2022 Cortex-A510, same process, same frequency) but able to provide 8% with higher performance (as before).

Source: electronicsweekly.com

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