Apple M3 Pro Chip Has 25% Less Memory Bandwidth Than M1/M2 Pro

Apple's latest M3 Pro chip in the new 14-inch and 16-inch MacBook Pro has 25% less memory bandwidth than the M1 Pro and M2 Pro chips used in equivalent models from the two previous generations.

m3 pro chip
Based on the latest 3-nanometer technology and featuring all-new GPU architecture, the M3 series of chips is said to represent the fastest and most power-efficient evolution of Apple silicon thus far. For example, the 14-inch and 16-inch MacBook Pro with M3 Pro chip is up to 40% faster than the 16-inch model with M1 Pro, according to Apple.

However, looking at Apple's own hardware specifications, the M3 Pro system on a chip (SoC) features 150GB/s memory bandwidth, compared to 200GB/s on the earlier M1 Pro and M2 Pro. As for the M3 Max, Apple says it is capable of "up to 400GB/s." This wording is because the less pricey scaled-down M3 Max with 14-core CPU and 30-core GPU has only 300GB/s of memory bandwidth, whereas the equivalent scaled-down M2 Max with 12-core CPU and 30-core GPU featured 400GB/s bandwidth, just like its more powerful 12‑core CPU, 38‑core GPU version.

Notably, Apple has also changed the core ratios of the higher-tier M3 Pro chip compared to its direct predecessor. The M3 Pro with 12-core CPU has 6 performance cores (versus 8 performance cores on the 12-core M2 Pro) and 6 efficiency cores (versus 4 efficiency cores on the 12-core M2 Pro), while the GPU has 18 cores (versus 19 on the equivalent M2 Pro chip).

Additionally, while the M3 chip's 16-core Neural Engine has the same number of cores as the one Apple featured in the 3nm-based A17 Pro chip that debuted in the iPhone 15 Pro series in September, it's comparatively weaker on paper in terms of maximum achievable throughput, which is measured in trillions of operations per second (TOPS).

According to Apple, the M3 Neural Engine is capable of 18 TOPS, whereas the A17 Pro Neural Engine is capable of 35 TOPS. It's hard to say for certain, but it is possible that the iPhone 15 Pro requires a higher performing Neural Engine for features like computational photography and Face ID, whereas the M3 can compensate in other areas like machine learning by utilizing its additional GPU cores.

Taken together, it's presently unclear what real-world difference these changes make to M3 performance when pitted against Apple's equivalent precursor chips in various usage scenarios, especially given that the latest processors include new Dynamic Caching memory allocation technology which ensures that only the exact amount of memory needed is used for each task.

m3 pro soc
This opaqueness is not helped by the fact that Apple advertises the power of the new M3 Pro and M3 Max chips by repeatedly emphasizing comparisons to the M1 Pro and M1 Max, rather than the more recent M2 variants, against which performance gains appear more modest. Hopefully we will learn more in time when the first thoroughgoing third-party benchmarks become available.

The new MacBook Pro models are available to order now, and they will begin arriving to customers and launch in stores on Tuesday, November 7. Be sure to check out our MacBook Pro announcement coverage for all the details.

Related Roundup: MacBook Pro 14 & 16"
Tag: M3
Related Forum: MacBook Pro

Top Rated Comments

kiranmk2 Avatar
6 weeks ago
The mid-range models are too good, so they are nerfing them to push people to spend more on the top end models. Clearly done to boost the revenues in the short term in the face of declining sales (via increased revenue per device).

As I have said before (and will say again), this strategy does work well if you are popular and make good products, but eventually you will push people past the point where they are willing to spend more and sales/revenue will fall off a cliff.
Score: 68 Votes (Like | Disagree)
pappl Avatar
6 weeks ago
- Still 8GB base RAM
- IMHO Minor performace upgrades compared to other systems (not Intel base systems but nVidia systems)
- Still no AV1 Encoder ?‍♀️
- Reduced mem bandwith

Come on, where is the PRO?

nVidia was way ahead compared to M2, i don't see any change with M3.
This will not end well, and all the marketing ********ting (see event intros) make me angry.
Score: 49 Votes (Like | Disagree)
Jony Ive and Co. Avatar
6 weeks ago
This is outrageous. Apple should improve raw specs with every iteration, not go backwards in terms of memory bandwidth and Neural Engine. I'd expect the number of CPU cores to increase IN ADDITION to performance and efficiency gains for each individual core.

And it's also ridiculous whenever I see them not comparing with the direct predecessor (i.e. M2). They should squarely compare M3 against M2, and this goes for A17 Pro too when they compared it against A14 instead of A16. Same with comparing against "the most popular Windows PC" etc
Score: 48 Votes (Like | Disagree)
iMean Avatar
6 weeks ago when the M8 arrives, there will be 40 efficiency cores and 0 performance cores ?
Score: 42 Votes (Like | Disagree)
widestload Avatar
6 weeks ago
Well they don't want to make it too good do they, otherwise where would then M4 have to go for its gains? (Sorry, I'm cynical :p)
Score: 35 Votes (Like | Disagree)
everlast3434 Avatar
6 weeks ago
I heard this is the best chip they’ve ever made!
Score: 35 Votes (Like | Disagree)

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