The use of the M2 chip is the new 13-inch MacBook Pro’s biggest change compared to the M1 version Apple launched in 2020, but it’s apparently not the only one. YouTubers on the Max Tech and Created Tech channels (via MacRumors) have run speed tests on the 256GB version of the M2 MacBook Pro and discovered that the SSD’s read and write speeds are as much as 50% slower than the 256GB SSD in the M1 MacBook Pro.
The culprit appears to be the NAND flash configuration. Both YouTubers took the bottom off of the new MacBook Pro and discovered that the 256GB versions use just one 256GB NAND flash chip, whereas the M1 MacBook Pro uses a pair of 128GB flash chips. On drives with more physical NAND chips, SSD controllers use a process called interleaving to read data from and write data to multiple physical chips at once. Use fewer chips, and you can limit your peak performance.
While unfortunate for anyone who buys the cheapest version of the MacBook Pro, this problem isn’t unique to Apple. Many modern SSDs for PCs only offer their maximum rated speeds starting at the 1TB or 2TB capacities. Having higher-density NAND chips can increase your maximum capacity, which is what makes it possible to fit 4TB of storage in a drive that’s just a bit bigger than a stick of gum. But speed drops at lower capacities are one unfortunate side effect of increased density.
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