SDRAM (Synchronous DRAM) Almost all systems used to ship with 3.3 volt, 168-pin SDRAM DIMMs. SDRAM is not an extension of older EDO DRAM but a new type of DRAM altogether. SDRAM started out running at 66 MHz, while older fast page mode DRAM and EDO max out at 50 MHz. SDRAM is able to scale to 133 MHz (PC133) officially, and unofficially up to 180MHz or higher. As processors get faster, new generations of memory such as DDR and RDRAM are required to get proper performance. DDR (Double Data Rate SDRAM) DDR basically doubles the rate of data transfer of standard SDRAM by transferring data on the up and down tick of a clock cycle. DDR memory operating at 333MHz actually operates at 166MHz * 2 (aka PC333 / PC2700) or 133MHz*2 (PC266 / PC2100). DDR is a 2.5 volt technology that uses 184 pins in its DIMMs. It is incompatible with SDRAM physically, but uses a similar parallel bus, making it easier to implement than RDRAM, which is a different technology. Rambus DRAM (RDRAM) Despite it's higher price, Intel has given RDRAM it's blessing for the consumer market, and it will be the sole choice of memory for Intel's Pentium 4. RDRAM is a serial memory technology that arrived in three flavors, PC600, PC700, and PC800. PC800 RDRAM has double the maximum throughput of old PC100 SDRAM, but a higher latency. RDRAM designs with multiple channels, such as those in Pentium 4 motherboards, are currently at the top of the heap in memory throughput, especially when paired with PC1066 RDRAM memory. DIMMs vs. RIMMs DRAM comes in two major form factors: DIMMs and RIMMS. DIMMs are 64-bit components, but if used in a motherboard with a dual-channel configuration (like with an Nvidia nForce chipset) you must pair them to get maximum performance. So far there aren't many DDR chipset that use dual-channels. Typically, if you want to add 512 MB of DIMM memory to your machine, you just pop in a 512 MB DIMM if you've got an available slot. DIMMs for SDRAM and DDR are different, and not physically compatible. SDRAM DIMMs have 168-pins and run at 3.3 volts, while DDR DIMMs have 184-pins and run at 2.5 volts. RIMMs use only a 16-bit interface but run at higher speeds than DDR. To get maximum performance, Intel RDRAM chipsets require the use of RIMMs in pairs over a dual-channel 32-bit interface. You have to plan more when upgrading and purchasing RDRAM.
Simm = Single In-line Memory Module. Dimm = Dual In-line Memory Module. Rimm = RDRAM In-line Memory Module. Simms were common from the early 1980s to the late 1990s. Simms and Dimms are very similar, except that Dimms have electrical contacts on each side of the module, while the contacts on SIMMs on both sides are redundant. Also, Simms are 32bit, Dimms are 64bit. Rimms are obsolote, and were only used by very few Intel Pentuim 3 based motherboards, and early Pentuim 4 motherboards, and while perfomace was good, they were over 3 times the cost of similar SD Ram (Dimm) ram sticks. That, and the manufacturer of RDRAM Rimms taking various other companines in the Ram market to court are ther main reason why RDRAM is no longer used.
There are several different formats of RAM, including different types for PCs and laptops. Laptops typically require SO-DIMM RAM, while PCs typically require some form of DIMM RAM. SO-DIMMs have a varying number of pins from 100 to 256, the number of pins relates and notch spacing relates to the memory capability. DIMMs vary in pin numbers from 72 to 284.
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