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Direct Rambus DRAM or DRDRAM (sometimes just called Rambus DRAM or RDRAM) is a type of synchronous dynamic RAM. RDRAM was developed by Rambus inc., in the mid-1990s as a replacement for then-prevalent DIMM SDRAM memory architecture.
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How many types of RAM are there?
Dynamic Random Access Memory(DRAM):-contents are constantly refreshed 100times per second.Access time 60-70 nanoseconds.Synchronous dynamic random access memory(SDRAM):- quicker than DRAMaccess time than 60 nanoseconds.Direct rambus Dynamic Random Access Memory(DRDRAM):- new type of ram architecture.access time is 20 times faster than DRAM.more expensive.Static random access memory(SRAM):- doesn't need refreshing.retains contents as long as power applied to the chip.access time is around 10 nanoseconds.used for cache memory, CPU registers.CMOS SRAM also data and time settings, powered by small battery.Cache memory:- small amount of memory typically 256 kilobytes to 32 megabytes (depending on computer).temporary storage for often used instructions and datacpu checks to see whether the next instructions it requires in cache.if not the cpu has to fetch next information from the main memory.Often implemented in multiple levels: L1I/L1D, L2, L3, etc.Video random access memory:- holds the data that can be displayed on the computer.Has two data paths allowing to READ & WRITE to occur at same timea graphics card may have its own VRAM chip on board.Flash Memory:- contents are retained even without powerread cycles are similar to SRAMunfortunately write cycles are about 100 times slower than read cyclesdue to this read/write timing asymmetry, these are more commonly used as "solid state disks" like Compact Flash, SD cards, "USB pen drives", etc. than as normal computer memoryNonvolatile Random Access Memory(NOVRAM):- contents are retained even without powerimplemented as and SRAM with Flash Memory backup storageat power on, internal circuits copy the Flash Memory to the SRAM all bits at the same time in one cyclewhile power is on the SRAM is accessed as normalwhen a signal is received from the powersupply warning that power is turning off, internal circuits copy the SRAM to the Flash Memory all bits at the same time, however as the Flash Memory write time is much longer than its read time this powersupply warning signal must significantly precede actual loss of power at the NOVRAM chip.Ferrite magnetic core memory: contents are retained even without powerhas been considered obsolete since about 1980even with automated machine assembly these still required significant hand labor to buildFerromagnetic Random Access Memory(FRAM):- contents are retained even without powerIntegrated circuits intended to replace DRAM are still in development
Wth are the two types of ram?
There are lots, too many to name. Some of the popular ones are:EDO (Obsolete)SDRAM (Mostly Obsolete)RAMBUS (Obsolete) - Data transfers fast, but takes a long time to find. Only used on P4 systems.DDR/DDR2/DDR3 - Current technology. Basically a pumped up version of SDRAMGDDR2 - An early version of DDR2, only used on graphics cards.AnswerDynamic Random Access Memory(DRAM):- cotents are constantly refreshed 100times per second.Access time 60-70 nanoseconds.a nano second is equal to 1billionth of a second.synchorus dynamic random access memory(SDRAM):-quicker than DRAMaccess time than 60seconds.Direct rambous Dynamic Random Access Memory(DRDRAM):-new type of ram architecture.access time is 20times faster than DRAM.more expensive.Static random access memory(SRAM):-doen't need refreshing.retains contents as long as power applied to the chip.access time is arround 10seconds.used for cache memory.also data and time settingsas powered by small battery.Cache memory:-small amount of memory typically 256 or 512 kilobytes.temporary storage for often used instructionsCPU checks to see whether the next instructions it requires in cache.if not the CPU has to fetch next information from the main memory.Video random access memory:-holds the data that can b displayed on the computer.Has two data paths allowing to READ & WRITE to occur at same timea graphics card may hav its own VRM chip on board.virtual memory:-uses backing storageeg:-harddiskvirtual memory is much slower than the ram.
