Apple's 13-inch 256GB MacBook Pro M2 may have worse SSD performance than the equivalent M1 model, according to testing by YouTube sites Max Tech and Created Tech seen by MacRumors. The $1,300 base model showed around 50 percent slower read speeds (1,446 MB/s compared to 2,900 MB/s) with write speeds 30 percent lower.
Max Tech opened up the 13-inch MacBook Pro M2 and found that it only had a single 256GB NAND flash storage chip instead of two 128GB chips like the previous M1 model. That would mean the drive can only use two lanes in parallel, so performance is restricted to the speed of a single lane.
The higher-end 512GB and 1TB models don't appear to suffer from the issue, and many review units (like our own) shipped in a 1TB configuration. The slower disk speeds on the 256GB model could affect app loading times, file transfers and data fetching. Overall performance could also take a hit as the virtual memory (used when RAM is full) will be slower, and the base model only has 8GB of RAM.
It's not clear why Apple changed the configuration on this model, though the global chip shortage may be a factor. In any case, it's something to consider if you're looking at buying the 13-inch MacBook Pro M2.