Etron Tech EM636327 512K x 32 High Speed Synchronous Graphics DRAM(SGRAM) The EtronTech EM636327 is a 512K x 32 high-speed synchronous graphics DRAM (SGRAM) from Etron Technology that features fast access time (5/5/5.5/6.5/7.5ns) and fast clock rate (183/166/143/125/100 MHz).