sentences:  Note that this is half of the data transfer rate when double data rate signaling is used.JEDEC standard PC3200 timing is  with a 200 MHz clock, while premium-priced high performance PC3200 DDR DRAM DIMM might be operated at timing.Minimum random access time has improved from "t"RAC = 50 ns to , and even the premium 20 ns variety is only 2.5 times better compared to the typical case (~2.22 times better).