Six CPU cores, seven GPU cores and 32 Neural Engine cores

A20 Pro is manufactured on a 2nm process and combines a six-core CPU with a seven-core GPU. Apple has also installed two 16-core Neural Engines, for 32 Neural Engine cores in total, while increasing memory bandwidth by 50 percent over A19 Pro.

Apple advertises CPU gains of up to 20 percent over A19 Pro in the devices for which it publishes that comparison, while the seven-core GPU is rated at up to 40 percent faster. The company also claims twice the compute capability for on-device AI models through the new dual Neural Engine.

Those are vendor measurements rather than universal performance multipliers. Since iPhone 18 Pro reached customers on September 18, however, independent testing has provided enough data to establish that the generational jump is not merely a specification-sheet exercise.

Shipping hardware confirms a large CPU gain

Gigazine tested an iPhone 18 Pro directly against an iPhone 17 Pro using Geekbench 7. The new phone scored 4,030 single-core and 11,507 multi-core, compared with 3,301 and 9,185 respectively for the previous model. In that particular test, the gains are roughly 22 percent and 25 percent.

Its GPU benchmark increased from 44,062 on iPhone 17 Pro to 61,566 on iPhone 18 Pro, putting the improvement close to 40 percent. That result is broadly consistent with the scale of Apple's maximum GPU claim.

GSMArena measured about 27 percent more multi-core CPU performance and a smaller 13 percent improvement in its GPU-heavy comparisons, while its combined AnTuTu 11 result increased by roughly 43 percent. The spread is useful: no single percentage can characterize a modern SoC when different workloads stress CPU, GPU, memory and storage in different proportions.

Apple moved DRAM out of the heat path

The less obvious architectural change is in the package. Apple says its new M-series-inspired design places the silicon die and memory side by side. Previous iPhone chips used a package-on-package arrangement with DRAM stacked above the processor.

Moving the memory laterally removes it from the processor's direct thermal path. A20 Pro can consequently connect more directly to the iPhone 18 Pro family's vapor chamber. Apple is not relying solely on a smaller manufacturing process to improve efficiency; it has redesigned the physical route heat takes away from the silicon.

The 50 percent increase in memory bandwidth is particularly relevant to graphics and local AI workloads that move large quantities of data. The packaging change also makes sustained performance inseparable from the thermal system built around A20 Pro.

The Pro Max shows what additional cooling area can buy

Apple advertises up to a 40 percent sustained-performance improvement for iPhone 18 Pro over the previous generation, crediting the combination of A20 Pro, the new package and a redesigned vapor chamber. Independent stress testing paints a more device-dependent picture.

Tom's Guide recorded 79.4 percent stability for iPhone 18 Pro Max in its 3DMark Wild Life Extreme Stress Test, compared with 65.2 percent for 17 Pro Max. The smaller 18 Pro moved only from 61.1 to 62.8 percent against its predecessor in the same test.

GSMArena similarly measured 72 percent CPU stability in APSI Bench on the smaller 18 Pro but 48 percent GPU stability in the 3DMark Wild Life Extreme stress test. Its testing found the compact model behind the Pro Max under prolonged load and slightly behind its predecessor in some sustained scenarios.

That does not mean the new cooling design does nothing. A faster processor can use its thermal envelope to perform more work before throttling, and the Pro Max simply has more physical area available for heat dissipation. The silicon may be the same; its thermal environment is not.

Graphics are one of A20 Pro's clearest advances

Tom's Guide measured 62 frames per second from iPhone 18 Pro in 3DMark Solar Bay Unlimited and 67.9 fps from Pro Max. In its comparison, those results put the two devices 33 percent and 45 percent ahead of their respective iPhone 17 Pro predecessors.

That tells us more about the graphics transition than the move to seven GPU cores alone. A20 Pro has to support demanding games, hardware ray tracing and workloads that increasingly mix conventional rendering with neural acceleration. Memory bandwidth and cooling can become nearly as important as the raw number of compute units.

For gaming, peak and sustained performance should still be separated. A short benchmark shows what the chip can reach. Twenty consecutive graphics loops start revealing what the entire phone can actually cool.

Two Neural Engines do not make every AI workload twice as fast

Apple has doubled the total Neural Engine core count by using two 16-core blocks and says the architecture provides twice the compute capability for on-device AI models. Neural Accelerators integrated into the CPU add another path for selected operations.

Tom's Guide measured Geekbench AI Neural Engine scores of 69,245 on iPhone 18 Pro and 71,974 on Pro Max, which its comparisons put around 41 to 48 percent above the previous generation. That is a substantial improvement, but not a doubling in this particular workload.

There is no contradiction in that result. Doubling one specialized hardware resource does not automatically double an entire application's speed. Model architecture, numerical precision, memory traffic and work executed elsewhere in the SoC can become the next bottlenecks.

The same chip also has to power a foldable iPhone

A20 Pro is not exclusive to the iPhone 18 Pro family. Apple is also using it in iPhone Duo, its foldable model announced on September 9 and scheduled to become available on October 23.

Duo gives the SoC a different job. A new display engine has to drive its inner and outer screens, while another vapor chamber handles sustained loads. Apple claims up to 35 percent better sustained performance than iPhone 17 Pro for this implementation.

That makes A20 Pro more of a platform than a processor tied to one phone. A compact 18 Pro, a larger Pro Max and a foldable Duo can share the same core silicon while producing different behavior because their displays, cooling systems and power envelopes are different.

The 2nm label only explains part of the leap

Post-launch measurements establish A20 Pro as a substantial generational upgrade. CPU performance is clearly higher, graphics have made a large jump and memory bandwidth has increased by half. The same data also make it difficult to attribute everything to the process node.

Pro Max is the useful counterexample. Give the same silicon a chassis with more favorable heat dissipation and sustained results can separate sharply from the smaller Pro. Apple has changed process technology, chip packaging, memory architecture and cooling at the same time.

That may be A20 Pro's more durable engineering change. Instead of treating the processor as a packaged component that the phone must somehow cool afterward, Apple has redesigned the package as the beginning of a thermal path running directly from the die into the device.