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 EDO DRAM. Extended Data Out DRAM EDO speeds are measured in nanoseconds. You can buy EDO as dimm fast as 50ns for your personal computer main memory (you may see faster EDO DRAM on some graphics cards. EDO memory is commonly available as 72-pin SIMMs). FPM DRAM. Fast Page Mode DRAM Fast-page mode is becoming increasingly scarce, but, ram unless you''re running a very early dimm system (430NX chipset or earlier) or a 486 system, you probably don''t want to get DRAM. Fast-page mode memory comes in SIMMs. RDRAM is shipped in RIMMs (RAMBUS inline memory modules). Future systems using the Intel 820 chipset and the upcoming 600MHz plus Pentium IIIs will use RAMBUS ram memory, but they aren''t out as of this writing. Way back in the dark ages of the PC architecture, I once owned an original Compaq portable. While the Compaq supported a whopping 640KB of RAM, it only came with 256KB. I upgraded my Compaq myself with an additional 384KB of memory by carefully inserting dimm 27 individual 16KB RAM chips. The hunger for memory has steadily increased since then; 64MB is no longer unusual. Upgrading memory is easier, too; you no longer must painfully insert individual RAM chips. As noted in ram the introduction, dimm there''s a virtual alphabet soup of memory types: SDRAM, EDO, FPM, SIMM, and DIMM. It certainly can create a great deal of confusion. RAM itself stands for "random access memory," meaning the CPU can access any memory address without reading all addresses before it. (ROM—read only memory—is random access, too, but you can''t write to it). It gets worse, because memory comes in different speeds, and some types don''t work in some systems. Here''s the rundown on the three memory ram types used in today''s systems.... SDRAM. Synchronous DRAM SDRAM''s speed is typically measured in MHz (for example, 100MHz), although you do see references to 10ns SDRAM ("ns" stands for nanosecond or one billionth of a second). SDRAM for PCs comes in DIMMs. These refer to SDRAM DIMMs rated at different dimm memory bus speeds. For any CPU running at a 100MHz bus speed you should get SDRAM. Some future motherboards will ram support SDRAM. Although there''s a price premium, SDRAM will run in a PC100 system. You can think of RAM as an incredibly fast hard drive that stores information temporarily instead of permanently. When you start a program it is loaded from the hard drive into RAM. When a program is running in RAM it can run hundreds to thousands of times faster than it can if run directly from the hard drive. The problem is that the capacity of a standard dimm hard drive is many times the size of a computer''s RAM size, meaning it is possible to load so many programs that the RAM can no longer hold them. When that happens, your computer''s virtual memory kicks in, and that''s bad. Virtual memory is simply your hard drive trying to act like a RAM chip. Since the hard drive is so ram and dimm much slower than real memory, programs stutter and sometimes crash when the hard ram drive has to do dimm a job it was never ram designed for. There are only two solutions dimm to this problem: close some programs until virtual memory is no longer needed, or add more physical memory. If you can afford it (and current memory prices are low enough that ram practically anyone should be able to), the latter solution is always preferable. Would you like to find ddr, simm or dimm memory but aren't sure where to look? Search no further. We have any type of memory for any computer you have. Shop our pages and purchase everything you need online!
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