A quick look inside the base-level M2 Pro MacBook Pro revealed something I hadn’t expected to see – or rather, something was missing that I had expected to see. Like the base-level M2 MacBook Air, the base-level of the latest 14-inch MacBook Pro appears to contain fewer NAND chips — with higher capacity — than the previous generation. This results in SSD read and write performance that is significantly lower than the previous generation.
The base model M1 and M2 MacBook Air offer only 256 GB of storage. With the M1 MacBook Air, that storage was split between two 128 GB Kioxia NAND chips. When Apple moved to the M2, they switched to newer NAND chips that offered 256 GB of storage per chip. This meant that the base model M2 MacBook Air with only 256 GB of storage had only one NAND chip, and that impacted the performance of the SSD.
Like the M1 Air, the base 512GB M1 Pro had its storage split across four 128GB NAND chips. In iFixit’s teardown, they show two 128 GB NAND chips on one side of the board and another two 128 GB NAND chips on the other side. Like the M2 Air before it, the M2 MacBook Pro appears to have switched to larger NAND chips, with the result that the base model sees slower SSD performance.
With the noticeably lower SSD performance in my M2 Pro MacBook Pro, I wanted to take a look to confirm why. Sure, where the 512GB M1 Pro MacBook Pro had two NAND chips visible on the front of the motherboard and another two on the back, the M2 Pro MacBook Pro only had one visible on the front of the board. There’s probably a second NAND chip directly opposite this, like the M1 had.
While the higher storage density of NAND chips is nice, it’s always disappointing when a product deteriorates between generations. Fortunately, most people do not see the impact of this in everyday use. Read and write speeds on the drive are still extremely fast, so the difference will probably only be noticeable in extreme edge cases.
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