According to 9to5Mac, the base MacBook Pro with the M2 chip has a slower SSD than its predecessor. In the BlackMagic test, the 512 GB SSD in Apple's latest model displayed read speeds of around 2970 MB/s and write speeds of around 3850 MB/s for a drive of the same capacity.
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The main reason for this issue is most likely the use of NAND memory chips. According to 9to5Mac, the previous generation 512GB MacBook Pro had four memory chips, while the M2 version had only two. The drive's capacity remained the same, but its performance deteriorated as parallelization of read and write operations worsened.
Apple's new MacBook Air models with the M2 chip and 256GB storage and the 13-inch MacBook Pro had slower memory than the M1 processor versions. However, these are relatively entry-level laptops. The 14-inch MacBook Pro is not a $2,000 computer designed for creative professionals and developers.
MacBook Pro models with larger storage capacities do not suffer from the performance degradation of the drive. For instance, the 14-inch MacBook Pro (M2 Pro + 2TB and M2 Max + 1TB) has a read speed of 5293 MB / s and a write speed of 6168 MB / s, which outperforms the model with a 512 GB drive.
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Despite the 512 GB SSD's shortcomings, the MacBook Pro still has enough bandwidth to play 12K ProRes 422 HQ video at 60 frames per second.