“E28 as an upgrade from the E26
As with the PCIe 4.0 generation, which started with the E16 controller and later received the more efficient E18 , Phison is now following up with the PCIe 5.0 controllers. While the E26 ushered in the new era and still dominates the market, the E28 follows with even more performance and efficiency. (Translation by Google from German to English)”- computerbase.de
Source: computerbase.de