Apple A19

CPU

Both the A19 and A19 Pro feature a 6-core CPU architecture with two performance cores and four efficiency cores, operating at frequencies up to 4.26 GHz for performance cores and 2.60 GHz for efficiency cores.^[4] The A19 Pro variant includes enhanced cache configurations and improved front-end bandwidth and branch prediction on the performance cores.

The performance cores in the A19 feature 8MB of L2 cache, while the efficiency cores have 4MB. The A19 Pro increases this to 16MB for performance cores and 6MB for efficiency cores. Additionally, the A19 includes a 12MB system-level cache, expanded to 32MB in the A19 Pro.^[4]

GPU

The A19 features a 4-core or 5-core Apple-designed GPU (80 execution units, 640 ALUs, 5 clusters) based on the new Apple10 architecture, while the A19 Pro includes both 5-core and 6-core configurations depending on the device (96 execution units, 768 ALUs, 6 clusters).^[4] The iPhone 17e uses the A19 with a 4-core GPU, unlike the iPhone 17 which has a 5-core GPU. The iPhone Air uses the A19 Pro with a 5-core GPU, while the iPhone 17 Pro and Pro Max feature the full 6-core GPU configuration.

The Apple10 architecture introduces doubled FP16 performance compared to previous generations and includes dedicated tensor processing units called "Neural Accelerators" integrated into each GPU core. These units are optimized for matrix multiplication operations in machine learning workloads, enabling approximately up to 4x the peak GPU compute performance on the A19 Pro compared to the A18 Pro. The architecture also includes updated dynamic caching and unified image compression.^[5]

Neural engine

The A19 series includes a 16-core Neural Engine with improved memory bandwidth compared to the A18 generation, and works alongside the GPU's integrated Neural Accelerators for AI-related tasks.

Memory and media

The A19 series supports LPDDR5X memory with different specifications between variants. The A19 includes 8GB of LPDDR5X (8533 MT/s) memory providing 68.2 GB/s of memory bandwidth, while the A19 Pro features 12GB of LPDDR5X (9600 MT/s) memory with bandwidth up to 76.8 GB/s. Both chips include updated display engines and image signal processors, with the A19 Pro exclusively supporting Apple ProRes RAW recording in addition to standard H.264, H.265, and ProRes formats.^[5]

Security

Starting with all iPhone 17 models and iPhone Air, devices based on the A19 and A19 Pro include Memory Integrity Enforcement (MIE), a hardware and software-based memory safety system utilizing ARM's Enhanced Memory Tagging Extension (EMTE) in synchronous mode. The system operates continuously to defend against buffer overflow and use-after-free vulnerabilities while protecting against side-channel attacks.^[6][7]

Thermal management

The A19 Pro includes enhanced thermal management in the iPhone 17 Pro and Pro Max models, featuring a vapor chamber containing deionized water, laser-welded into the aluminum unibody. This helps move heat away from the A19 Pro chip, enabling up to 40% better sustained performance during demanding tasks, such as video editing, gaming, and large language model processing.

A19

• iPhone 17e – 6-core CPU and 4-core GPU, 12MB system-level cache, 8GB LPDDR5X-8533 RAM, includes C1X cellular modem
• iPhone 17 – 6-core CPU and 5-core GPU, 12MB system-level cache, 8GB LPDDR5X-8533 RAM
• Apple Studio Display (second generation)^[10]

A19 Pro

• iPhone Air – 6-core CPU and 5-core GPU, 32MB system-level cache, 12GB LPDDR5X-8533 RAM,^[11] includes C1X cellular modem
• iPhone 17 Pro – 6-core CPU and 6-core GPU, 32MB system-level cache, 12GB LPDDR5X-9600 RAM, includes a Qualcomm X80^[12] cellular modem and vapor chamber cooling
• iPhone 17 Pro Max – 6-core CPU and 6-core GPU, 32MB system-level cache, 12GB LPDDR5X-9600 RAM, includes Qualcomm X80^[12] cellular modem and vapor chamber cooling
• Apple Studio Display XDR^[10]