The speeds the various DDR generations rate at vary, but what you have is pretty close to the average or max speeds.
DDR1: 100-400 MHz
DDR2: 400-1066 MHz
DDR3: 800-2133 MHz
DDR4: 1600-3200 MHz
DDR5: 3200-6400 MHz
DDR6: TBA officially, but some estimate it to be 4x faster than DDR4.
These speeds ignore memory overclocking, which some BIOSes and CPUs support (for instance, with AMD's XAMP overclocking algorithm built into many BIOSes, you can overclock DDR4 to 3600 MHz. It may or may not be stable). The GDDR speeds are even faster, though that's for GPUs.