ARM Cortex-X4
 | This article provides insufficient context for those unfamiliar with the subject. (July 2023) |
The ARM Cortex-X4 is a high-performance CPU core from Arm, released in 2023 as part of Arm's "total compute solution."[1] 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).[2][3][4][5]
| General information | |
|---|---|
| Launched | 2023 |
| Designed by | ARM Ltd. |
| Performance | |
| Address width | 40-bit |
| Cache | |
| L1 cache | 128 KiB (64 KiB I-cache with parity, 64 KiB D-cache) per core |
| L2 cache | 512–2048 KiB per core |
| L3 cache | 512 KiB – 32 MiB (optional) |
| Architecture and classification | |
| Microarchitecture | ARM Cortex-X4 |
| Instruction set | ARMv9.2-A |
| Physical specifications | |
| Cores |
|
| Products, models, variants | |
| Product code name |
|
| Variant | |
| History | |
| Predecessor | ARM Cortex-X3 |
| Successor | ARM Cortex-X925 |
Architecture changes in comparison with ARM Cortex-X3
The processor implements the following changes:[2][3][4]
- 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)
- ARMv9.2
Performance claims:
- 15% peak performance improvement over the Cortex-X3 in smartphones (3.4GHz, 2MB L2, 8MB L3).[4]
- 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).[4]
Architecture comparison
| uArch | Cortex-A78 | Cortex-X1 | Cortex-X2 | Cortex-X3 | Cortex-X4 | Cortex-X925 |
|---|---|---|---|---|---|---|
| Peak clock speed | ~3.0 GHz | ~3.25 GHz | ~3.4 GHz | ~3.8 Ghz | ||
| Decode Width | 4 | 5 | 6 | 10[6] | 10 | |
| Dispatch | 6/cycle | 8/cycle | 10/cycle | 10/cycle | ||
| Max In-flight | 2x160 | 2x224 | 2x288 | 2x320 | 2x384 | 2x768 |
| L0 (Mops entries) | 1536[7] | 3,072[7] | 1536 | None[6] | ||
| L1-I + L1-D | 32+32 KiB[8] | 64+64 KiB | 64+64 KiB | |||
| L2 | 128–512 KiB | 256KiB – 1 MiB | 0.5 – 2 MiB | 0.5 – 3MiB | ||
| L3 | 0–8 MiB | 0–16 MiB | 0–32 MiB | 0–32 MiB | ||
| Architecture | ARMv8.2 | ARMv9 | ARMv9.2 | ARMv9.2 | ||
Usage
- MediaTek Dimensity 9300/9300+[9]
- Qualcomm Snapdragon 8 Gen 3 (2023)[10]
- Google Tensor G4[11]
See also
- ARM Cortex-A720, related efficient sustained performance microarchitecture
- ARM Cortex-A520, related high efficient microarchitecture
- Comparison of ARMv8-A cores
References
- ^ Dahad, Nitin (2023-06-02). "Arm Total Compute Solution 2023 targets premium smartphones". Embedded.com. Retrieved 2024-01-17.
- ^ a b "Arm Cortex-X4 advances frontiers of CPU performance - Announcements - Arm Community blogs - Arm Community". community.arm.com. 2023-05-29. Retrieved 2023-09-16.
- ^ a b "Arm Introduces The Cortex-X4, Its Newest Flagship Performance Core". WikiChip Fuse. 2023-05-28. Retrieved 2023-05-30.
- ^ a b c d Bonshor, Gavin. "Arm Unveils 2023 Mobile CPU Core Designs: Cortex-X4, A720, and A520 - the Armv9.2 Family". www.anandtech.com. Retrieved 2023-05-30.
- ^ "TCS23: The complete platform for consumer computing - Announcements - Arm Community blogs - Arm Community". community.arm.com. 2023-05-29. Retrieved 2023-09-16.
- ^ a b "Arm Cortex-X4, A720, and A520: 2024 smartphone CPUs deep dive". Android Authority. 2023-05-29. Retrieved 2023-06-01.
- ^ a b Frumusanu, Andrei. "Arm's New Cortex-A78 and Cortex-X1 Microarchitectures: An Efficiency and Performance Divergence". www.anandtech.com. Retrieved 2023-06-01.
- ^ Schor, David (2020-05-26). "Arm Cortex-X1: The First From The Cortex-X Custom Program". WikiChip Fuse. Retrieved 2023-05-30.
- ^ "MediaTek says its Snapdragon 8 Gen 3 rival will be a beast (Updated)". Android Authority. 2023-05-29. Retrieved 2023-09-16.
- ^ "Qualcomm Snapdragon Tech Summit Live Blog: Compute Spotlight". Android Authority. 2023-05-29. Retrieved 2023-09-16.
- ^ "Latest Pixel 9 leak gives us a look at the Tensor G4 specs and benchmarks". Android Authority. 2024-06-01. Retrieved 2024-06-01.
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