ARM Cortex-X3

The ARM Cortex-X3 is the third generation X-series high-performance CPU core from Arm.

It forms part of Arm's Total Compute Solutions 2022 (TCS22) along with Arm's Cortex-A715, Cortex-A510, Immortalis-G715 and CoreLink CI-700/NI-700.

The processor implements the following changes:

• Decode width: 6 (increased from 5)
• Rename / Dispatch width: 8
• micro-op (MOP) cache: 1.5k entries (reduced from 3k)
• Reorder buffer (ROB): 320 entries (increased from 288)
• Execution ports: 15
• Pipeline length: 9 (reduced from 10)

Performance claims:

• 25% peak performance improvement over the ARM Cortex-X2 in smartphones

(3.3GHz, 1MB L2, 8MB L3).

• 11% IPC uplift over the ARM Cortex-X2, when based on the same process,

clock speed, and cache setup (also known as ISO-process).

• Google • Tensor G3
• MediaTek • Dimensity 9200
• Qualcomm • Snapdragon 8 Gen 2

"Prime" core

• ARM Cortex-A715, related high performance microarchitecture
• Comparison of ARMv8-A cores, ARMv8 family