Performance soars with UFS
Compared to eMMC, UFS shows much better performance in read speed, with an impressive 40 percent improvement in sequential read. When USB3.1 performance is optimized on the system (Gen1 5Gbps, Gen2 10Gbps), 40 percent better performance is achieved in a file copy scenario.
This improvement in performance is based mainly on two factors.
First of all, UFS has a LVDS (Low-Voltage Differential Signaling) serial interface with separately dedicated read/write paths. This allows full duplex (two-way interaction) so UFS can read and write simultaneously. In contrast, eMMC has a parallel interface which can only send data in one direction at a time; it can either read or write, but not at the same time.
Secondly, UFS has a Command Queue (CQ) that sorts out the commands that need to be carried out. Thus, multiple commands can be addressed at the same time and the order of tasks can be changed accordingly.
The combination of these two factors enables the Samsung UFS solution to have a sequential read speed, sequential write speed, random read speed and random write speed significantly faster than eMMC.
Reduced power consumption