DRAM stands for dynamic random access memory. DRAM devices usually use capacitor charges on an integrated circuit to store the digital information. The capacitor must me recharged frequently, so that the information is retained. So, DRAM is a volatile memory.
DRAMs are generally manufactured in different formats. Some of them are DIP which is Dual in-line package and SIPP, SIMM, DIMM and many other formats. The RAM memory cards used in present day computers are a type of DRAM in DIMM format. DDR3, DDR2 , DDR and SDRAM are synchronous DRAM modules.
DRAM is made to be in sync with the clock of system bus. DRAM chips may contain information after the power supply is removed for longer time at lower temperatures. Under proper conditions, a DRAM is found to contain data for several minutes after power off. This data can be used to break in to encrypted systems and steal private information.
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