ARM Cortex-X3

The ARM Cortex-X3 is the third generation X-series high-performance CPU core from Arm.^[1][2][3] 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.^[4]

ARM Cortex-X3

General information
Launched	2022
Designed by	Arm
Performance
Max. CPU clock rate	to 3.3 GHz in phones and 3.6 GHz in laptops
Address width	40-bit
Cache
L1 cache	128 KiB (64 KiB I-cache with parity, 64 KiB D-cache) per core
L2 cache	512–1024 KiB per core
L3 cache	512 KiB – 16 MiB (optional)
Architecture and classification
Instruction set	ARMv9.0-A
Physical specifications
Cores	1–8 per cluster
Products, models, variants
Product code name	Makalu ELP
Variant	ARM Cortex-A715 Neoverse V2
History
Predecessor	ARM Cortex-X2
Successor	ARM Cortex-X4

Architecture changes

in comparison with ARM Cortex-X2

The processor implements the following changes:^[1][5][6]

• 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 Cortex-X2 in smartphones (3.3GHz, 1MB L2, 8MB L3).^[1][7]
• 11% IPC uplift over the Cortex-X2, when based on the same process, clock speed, and cache setup (also known as ISO-process).^[3]

Usage

• Google Tensor G3
• MediaTek Dimensity 9200^[8]
• Qualcomm Snapdragon 8 Gen 2^[9]

Architecture comparison

uArch	Cortex-A78	Cortex-X1	Cortex-X2	Cortex-X3	Cortex-X4	Cortex-X925	Cortex-X930
Code name	Hercules	Hera	Matterhorn-ELP	Makalu-ELP	Hunter-ELP	Blackhawk	Travis
Architecture	ARMv8.2		ARMv9		ARMv9.2
Peak clock speed	~3.0 GHz			~3.25 GHz	~3.4 GHz	~3.8 GHz	~
Decode Width	4	5		6	10[10]	10
Dispatch	6/cycle	8/cycle			10/cycle
Max in-flight	2x160	2x224	2x288	2x320	2x384	2x768
L0 (Mops entries)	1536[11]	3,072[11]		1536	None[10]
L1-I + L1-D	32+32 KiB[12]	64+64 KiB				64+64 KiB
L2	128–512 KiB	256KiB – 1 MiB			0.5 – 2 MiB	0.5 – 3 MiB
L3	0–8 MiB		0–16 MiB		0–32 MiB	0–32 MiB

See also

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