Do you guys think there's any considerable (say >5%) read and or write speed difference between the various SSD capacity options of the 16" Macbook Pro?
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Speed difference amongst 16" SSD options?
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No one knows yet, we'll start seeing a bunch of benchmarks soon once people get their hands on them. If it's anything like previous models, the higher storage options get slightly faster for every step-up in storage size.
Not just limited to Apple's devices. All SSDs show increased IOPs and slight improvements in write speeds with larger storage sizes, with largest difference typically between 250GB and 500GB options, less difference between 1TB and 2TB. Take Samsung EVO 970 Plus as an example:
| Size | Read MB/s | Write MB/s | Read IOPs | Write IOPs |
| 250GB | 3500 | 2300 | 250.000 | 550.000 |
| 500GB | 3500 | 3200 | 480.000 | 550.000 |
| 1TB | 3500 | 3300 | 600.000 | 550.000 |
| 2TB | 3500 | 3300 | 620.000 | 560.000 |
Same pattern for different respectable brands and versions.
Bigger is better
Depends how the controller handles it. When you look at32GB vs 64 GB vs 128 vs 256 you see large increases because the controller can write on multiple channels in parallel. But as start comparing 512 GB to 1T to ... 8TB the performance increase will likely fall off because you are running into other limitations of how fast you can get data through the CPU and controller to all those storage modules. So my guess is that once you go above 1 or 2 TB the increase will be small. And if you order a system 8TB you should do it because you need 8TB because you do a lot of 8K or 4K video editing or something else very heavy duty where the files are huge.
As with everything in computing, there is always a performance bottleneck. And when engineers remove one bottleneck the next most important factor becomes the new bottleneck.