Yes, LPDDR4X in particular is rated for 4266 Mbps (at least that's the only spec available from https://www.samsung.com/semiconductor/dram/lpddr4x/ https://www.

Yes, LPDDR4X in particular is rated for 4266 Mbps (at least that's the only spec available from https://www.samsung.com/semiconductor/dram/lpddr4x/ https://www.samsung.com/semiconductor/dram/lpddr4x/ right now) while the top official JEDEC spec for DDR4 is 3200 Mbps. 4266 Mbps * 8 channels * 2 (bytes in a 16-bit channel) = 68.25GB/s theoretical maximum. (Or 4 channels * 4 bytes in a 32-bit channel, same deal.) See AIDA64 bandwidth benchmark results: https://storage-asset.msi.com/global/picture/news/2021/nb/lpddr-20210104-8.jpg https://storage-asset.msi.com/global/picture/news/2021/nb/lp... — these are from MSI's Intel Tigerlake laptops. There are AMD Renoir laptops with the same memory configuration too. This is not unique to Apple, this is what everyone has now. I guess the new big MBPs might have the largest version of this, but what the regular M1 has is not special whatsoever.