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 achieved 4900 MB/s read and 3950 MB/s write for a drive of the same capacity.
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The reason for this situation 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 just two. The performance of the drive remained constant, although the 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 significantly less memory than those with only one memory chip. But these are relatively entry-level laptops. The 14-inch MacBook Pro is a $2,000 computer designed for creative professionals and developers.
MacBook Pro models with larger storage capacity do not suffer from the performance degradation of the drive. So, 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, significantly outperforming the model with a 512 GB drive.
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The MacBook Pro's base version with a 512 GB SSD has enough storage to play 12K ProRes 422 HQ video at 60 frames per second.