The ARM Cortex-X4 is a high-performance CPU core from Arm, released in 2023 as part of Arm's "total compute solution". It serves as the successor of ARM Cortex-X3.
X-series CPU cores generally focus on high performance, and can be grouped with other ARM cores, such as ARM Cortex-A720 or/and ARM Cortex-A520 in a System-on-Chip (SoC).
Architecture changes in comparison with ARM Cortex-X3
The processor implements the following changes:
- ARMv9.2
- micro-op (MOP) cache removed (previously 1.5k entries)
- Decode width: 10
- Rename / Dispatch width: 10 (increased from 8)
- Reorder buffer (ROB): 384 entries (increased from 320)
- Execution ports: 21 (increased from 15)
- Pipeline length: 10 (increased from 9)
- Up to 2 MiB of private L2 cache (increased from 1 MiB)
- DSU-120
- Up to 14 cores (up from 12 cores)
- Up to 32 MiB of shared L3 cache (increased from 16 MiB)
Performance claims:
- 15% peak performance improvement over the Cortex-X3 in smartphones
(3.4GHz, 2MB L2, 8MB L3).
- 13% IPC uplift over the Cortex-X3, when based on the same process, clock speed,
and L3 cache (but 2 MiB L2 vs 1 MiB L2) setup (also known as ISO-process).
Architecture comparison
;"Prime" core
Usage
See also
References