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The ARM Cortex-X4 is a high-performance CPU core from Arm, released in 2023cite-ref-1[1] as part of Arm's "total compute solution".cite-ref-2[2] It serves as the successor of ARM Cortex-X3.cite-ref-4-3-0[3]

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).cite-ref-3-4-0[4]cite-ref-0-5-0[5]

• Architecture changes in comparison with ARM Cortex-X3

• Architecture comparison

• Usage

• See also

• References

The processor implements the following changes:cite-ref-4-3-1[3]cite-ref-3-4-1[4]cite-ref-0-5-1[5]

• 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).cite-ref-0-5-2[5]

• 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).cite-ref-0-5-3[5]

"Prime" core

| uArch | Cortex-A78 | Cortex-X1 | Cortex-X2 | Cortex-X3 | | Cortex-X925 |

|---|---|---|---|---|---|---|

| Code name | Hercules | Hera | Matterhorn-ELP | Makalu-ELP | Hunter-ELP | Blackhawk |

| Architecture | ARMv8.2 | ARMv8.2 | ARMv9 | ARMv9 | ARMv9.2 | ARMv9.2 |

| Peak clock speed | ~3.0 GHz | ~3.0 GHz | ~3.0 GHz | ~3.3 GHz | ~3.4 GHz | ~3.8 GHz |

| Decode width | 4 | 5 | 5 | 6 | 10 [ 6 ] | 10 [ 6 ] |

| Dispatch | 6/cycle | 8/cycle | 8/cycle | 8/cycle | 10/cycle | 10/cycle |

| Max in-flight | 2x 160 | 2x 224 | 2x 288 | 2x 320 | 2x 384 | 2x 768 |

| L0 (Mops entries) | 1536 [ 7 ] | 3072 [ 7 ] | 3072 [ 7 ] | 1536 | 0 [ 6 ] | |

| L1-I + L1-D | 32+32 KiB | 64+64 KiB | 64+64 KiB | 64+64 KiB | 64+64 KiB | 64+64 KiB |

| L2 | 128–512 KiB | 0.25–1 MiB | 0.25–1 MiB | 0.25–1 MiB | 0.5–2 MiB | 2–3 MiB |

| L3 | 0–8 MiB [ 8 ] | 0–8 MiB [ 8 ] | 0–16 MiB | 0–16 MiB | 0–32 MiB | 0–32 MiB |

• Google • Tensor G4cite-ref-9[9]

• MediaTek • Dimensity 9300/9300+cite-ref-10[10]

• Qualcomm • Snapdragon 8 Gen 3 (2023)cite-ref-11[11]

• ARM Cortex-A520, related high efficient microarchitecture

• ARM Cortex-A720, related efficient sustained performance microarchitecture

• Comparison of ARMv8-A cores

cite-note-11. ↑ "Arm Total Compute Solution 2023 targets premium smartphones". embedded.com. 2023-06-02. Retrieved 2024-01-17.

cite-note-22. ↑ "TCS23: The complete platform for consumer computing - Arm Community". community.arm.com. 2023-05-29. Retrieved 2023-09-16.

cite-note-4-33. ↑ "Arm introduces the Cortex-X4, its newest flagship performance core". WikiChip Fuse. 2023-05-28. Retrieved 2023-05-30.

cite-note-3-44. ↑ "Arm Cortex-X4 advances frontiers of CPU performance - Arm Community". community.arm.com. 2023-05-29. Retrieved 2023-09-16.

cite-note-0-55. ↑ "Arm Unveils 2023 Mobile CPU Core Designs: Cortex-X4, A720, and A520 - the Armv9.2 Family". www.anandtech.com. Archived from the original on May 29, 2023. Retrieved 2023-05-30.

cite-note-1-61. "Arm Cortex-X4, A720, and A520: 2024 smartphone CPUs deep dive". Android Authority. 2023-05-29. Retrieved 2023-06-01.

cite-note-2-72. "Arm's New Cortex-A78 and Cortex-X1 Microarchitectures: An Efficiency and Performance Divergence". anandtech.com. Archived from the original on May 26, 2020. Retrieved 2023-06-01.

cite-note-83. citerefschor2020Schor, David (2020-05-26). "Arm Cortex-X1: The First From The Cortex-X Custom Program". WikiChip Fuse. Retrieved 2023-05-30.

cite-note-99. ↑ "Latest Pixel 9 leak gives us a look at the Tensor G4 specs and benchmarks". Android Authority. 2024-06-01. Retrieved 2024-06-01.

cite-note-1010. ↑ "MediaTek says its Snapdragon 8 Gen 3 rival will be a beast (Updated)". Android Authority. 2023-05-29. Retrieved 2023-09-16.

cite-note-1111. ↑ "Qualcomm Snapdragon Tech Summit Live Blog: Compute Spotlight". Android Authority. 2023-05-29. Archived from the original on October 25, 2023. Retrieved 2023-09-16.