Thread by @QaM_Section31

As Arm officially announced new CPU core architectures, here is concise summary of these.

#Cortex

1) Cortex-X4
- First tapeout: N3E
- +15% Perf vs. same power, or -40% power vs. same perf.
- Performance compared under SPECRate@2017
- Criteria: 2 MB L2 cache, 8 MB L3 cache, 100ns latency, at 3.4 GHz. Iso-process, Iso-frequency.
- IPC: +7~8% on Geekbench5/6.

2) Cortex-A720
- SPECRate@2006 benchmark used, Iso-process, Iso-frequency, compared with A715.
- +20% power efficiency compared to the A715.
- Criteria: 32KB L1, 512KB L2, 8MB L3.

3) Cortex-A520
- SPECRate@2006 benchmark used, Iso-process, Iso-frequency, compared with A510.
- +8% Perf vs. same power, or -22% power vs. same perf.
- Criteria: 32KB L1, 256KB L2, 4MB L3.