A17 Pro vs A15 Bionic: How Much Faster?

Updated 15 November 2026 · Standard formula, shown below

The A17 Pro chip in the iPhone 15 Pro family is roughly 20–25% faster in CPU performance and about 30–40% faster in GPU performance than the A15 Bionic found in the iPhone 13 series and iPhone 14 base models. These figures come from benchmark comparisons and Apple’s own performance claims, and they translate to noticeably snappier app launches, smoother gaming, and better sustained performance under load.

Background: Apple’s Chip Naming and Generations

Apple’s Bionic chips have set the pace for smartphone performance since the A7 in 2013. The A15 Bionic, introduced in 2021 with the iPhone 13 lineup, was a major step forward with its 6-core CPU, 5-core GPU (in Pro models), and 16-core Neural Engine. It powered the iPhone 13 series, the iPhone SE (3rd generation), and the iPhone 14 and 14 Plus.

The A17 Pro, launched in 2023 exclusively in the iPhone 15 Pro and 15 Pro Max, is the first 3-nanometer chip in a smartphone. That process shrink allows more transistors (19 billion) in the same space, which translates to better performance and efficiency. The A17 Pro also introduced a dedicated hardware ray-tracing unit for gaming and a 6-core GPU with a new architecture.

How the Speed Difference Is Measured

Performance is typically measured in two ways: synthetic benchmarks and real-world usage. The most common benchmarks are Geekbench 6 (CPU) and GFXBench or 3DMark (GPU).

Geekbench 6 CPU: The A15 Bionic scores around 2200–2300 single-core and 5400–5500 multi-core. The A17 Pro scores around 2900–3000 single-core and 7200–7400 multi-core. That’s roughly a 25–30% improvement in single-core and 30–35% in multi-core.
GPU benchmarks: In GFXBench’s Aztec Ruins High Tier, the A17 Pro can hit 50–60 frames per second, while the A15 typically manages 35–40 fps. That’s a 40–50% improvement.
Real-world: App launch times are about 20–30% faster. Web page rendering is noticeably quicker. Games with heavy graphics, like Genshin Impact, run at higher frame rates and with more consistent performance.

CPU Architecture: What Changed

The A17 Pro uses two high-performance cores (called “E” cores) and four efficiency cores, just like the A15. But the high-performance cores are now based on a new microarchitecture that includes wider instruction decoders, deeper execution pipelines, and a larger branch predictor. This allows more instructions to be processed per clock cycle.

The clock speed also increased: the A15’s high-performance cores run at about 3.23 GHz, while the A17 Pro’s run at 3.78 GHz. That’s a 17% increase in raw clock speed, which directly contributes to the single-core performance boost.

The efficiency cores also got faster, which means everyday tasks like checking email or scrolling social media use less power while still feeling quicker.

GPU and Gaming: The Biggest Leap

The GPU is where the A17 Pro makes the most dramatic improvement. The A15’s GPU (in the iPhone 13 Pro) has 5 cores; the A17 Pro has 6 cores. But the architecture is completely new, with a redesigned shader core and a hardware ray-tracing unit.

Ray tracing is a technique that simulates how light interacts with objects in 3D scenes, producing realistic reflections and shadows. The A15 could only do this in software, which was slow. The A17 Pro does it in hardware, making games that use ray tracing run at playable frame rates.

For example, in a game like Resident Evil Village, which uses ray tracing, the A17 Pro can render at higher resolutions and with more detail than the A15 could manage. Even without ray tracing, the A17 Pro’s GPU is faster at traditional rendering, so games like Call of Duty: Mobile or Fortnite run at higher frame rates.

Real-World Performance: What You Actually Notice

Benchmarks are useful, but what does the difference feel like in daily use?

App launches: A 20–30% faster CPU means apps open almost instantly. A heavy app like a video editor or a 3D game might take 2 seconds on the A15 and 1.5 seconds on the A17 Pro.
Multitasking: Switching between apps is smoother, and more apps stay in memory without reloading.
Video editing: Exporting a 4K video in iMovie is about 30% faster on the A17 Pro.
Battery life: The 3-nanometer process makes the A17 Pro more power-efficient. Even though it’s faster, it doesn’t drain the battery faster. In fact, the iPhone 15 Pro often gets better battery life than the iPhone 14 Pro, which used the A16 Bionic (a slightly improved A15).

Common Misconception: Is the A16 Bionic Just an A15?

Many people think the A16 Bionic in the iPhone 14 Pro is a completely new chip. In reality, it’s a slightly refined A15: same CPU cores, same GPU, but a smaller process (4nm vs 5nm) and a few tweaks. The A17 Pro is a true generational leap because it uses a completely new CPU and GPU architecture.

So if you’re comparing an iPhone 15 Pro to an iPhone 14 Pro, the gap is similar to the A17 vs A15 gap. But if you’re comparing to an iPhone 13 Pro, the difference is even larger because the A15 in the 13 Pro is the same as the one in the 14 Pro (the 14 Pro’s A16 is only a few percent faster).

How to Choose: Do You Need the A17 Pro?

The A17 Pro is only in the iPhone 15 Pro and 15 Pro Max. If you’re deciding between those and an older iPhone, consider what you do:

Gamers: If you play graphically intense games or want to try console-style games on your phone, the A17 Pro is a significant upgrade. The ray tracing and faster GPU make a real difference.
Video editors and photographers: The faster CPU and improved image signal processor (ISP) make editing 4K/ProRes video smoother and faster.
General users: If you mostly use social media, email, and web browsing, you won’t notice a huge difference. The A15 is still very fast for everyday tasks.
Future-proofing: The A17 Pro’s 3nm chip is more efficient and likely to remain fast for more years. If you keep your phone for 4–5 years, the A17 Pro will age better.

Frequently Asked Questions

Is the A17 Pro worth the upgrade from an iPhone 13 Pro?

If you’re a heavy gamer or video editor, yes. The GPU and CPU improvements are substantial. If you use your phone for basic tasks, you might not notice the difference. The A15 in the iPhone 13 Pro is still very capable.

Does the A17 Pro make the iPhone 15 Pro run hot?

There were reports of the iPhone 15 Pro running warm during initial setup or heavy gaming, but this was largely due to software bugs and third-party apps that weren’t optimized. Apple released iOS updates to fix thermal management. Under normal use, the A17 Pro runs cooler than the A15 because it’s more efficient.

Can the A15 Bionic handle ray tracing?

No, the A15 does not have hardware ray tracing. It can only do software-based ray tracing, which is too slow for real-time gaming. The A17 Pro is the first iPhone chip with dedicated ray tracing hardware.

Is the A17 Pro faster than the A16 Bionic?

Yes. The A16 Bionic is essentially a slightly improved A15. The A17 Pro is a new architecture with a 3nm process, so it’s about 20–25% faster in CPU and 30–40% faster in GPU than the A16.

Does the A17 Pro have better battery life than the A15?

Yes, because it’s more power-efficient. The 3nm process means it uses less power for the same work. In real-world tests, the iPhone 15 Pro lasts about 1–2 hours longer than the iPhone 14 Pro for the same usage.

Is the A17 Pro future-proof for 5 years?

Probably. Apple’s chips tend to stay fast for many years. The A17 Pro’s 3nm process and new architecture should keep it competitive for at least 4–5 years, especially for gaming and AI tasks.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.