Apple currently uses very fast PCIe SSDs in all its new MacBooks. They also support the NVM Express controller. Server MacWorld stated that MacBooky should get the latest SSD chip that is compatible with NVMe – specifically the Optane chip. Some Windows laptops also use NVMe technology, but most manufacturers still rely on the older and slower SATA interface. Optane is a new type of SSD memory that is based on 3D Xpoint, which is a technology developed by Intel and Micron. Thanks to the technology, the disk can be 1000 times faster and more durable than conventional flash memory.
Optane together with NVMe will create a very high speed protocol storage. Of course, the Optane chip is also compatible with processors Skylake it wants Apple use in your upcoming generation MacBookThe new technology allows you to get the speed of an SSD even closer to the speed of RAM.
Apple is one of the first manufacturers to always want to have the latest technology in its computers. Proit is almost clear that Apple will use this technology and Mac drives will be even faster.
*Source: 9to5mac.com
In terms of speed, it is not above the HDD in the current generation iMac. :)