 The term "static" differentiates SRAM from DRAM ("dynamic" random-access memory) which must be periodically refreshed.SRAM is faster and more expensive than DRAM; it is typically used for CPU cache while DRAM is used for a computer's main memory.In 1965, Arnold Farber and Eugene Schlig, working for IBM, created a hard-wired memory cell, using a transistor gate and tunnel diode latch.