According to German tech site, WinFuture, Samsung could offer five capacity options for the 870 EVO: 250GB, 500GB, 1TB, 2TB, and a massive 4TB. The last storage variant is enormous, but to be fair, Samsung has offered it as an option since the 850 EVO. As its design, the SSD will reportedly ship out in its standard 2.5-inch SSD form factor for both the North American and European markets. However, Samsung has not made it clear if it will also distribute the revived SSD in an M.2 configuration. As for the controller and NAND chip that will be used, exact detail and information about these two components are still vague, although given its perceived nature as a storage drive with considerably faster speeds than a traditional HDD, we could be looking at triple-level cell (TLC) memory or Samsung’s own 3-bit MLC V-NAND. Which are pretty much the same thing.
That brings us comfortably to the transfer speeds of the 870 EVO. Assuming all other things remain constant, it’s unlikely Samsung will deviate from the typical 500MB/s average sequential read and write speeds for the lineup. In fact, that seems more likely to be, given the limitations of the SATA III interface. (Source: WinFuture via Tom’s Hardware, Hot Hardware)