Computers Memory

5 Things You Must Know About Memory Dimm Ddr

Published at 03/17/2012 03:25:19

Introduction

DIMM (dual in-line memory module) consists of random access memory circuits. These modules are placed on a circuit board. They can be used in servers, workstations and PCs. Dual In-Line Memory Module is a replacement of SIMM which is abbreviation of Single In-Line Memory Modules.

There are most common types of DIMM ddr memory like 72 pin, 100 pin DIMM, 144 pin SO-DIMM, 168 pin DIMM, 172 pin Micro DIMM, 184 pin DIMM, 200 pin SO-DIMM, 204 pin SO-DIMM, 214 pin Micro DIMM, 240 pin DIMM which is used for DDR2 SDRAM, 244 pin Mini DIMM. There are some DIMM slots which support DDR1, DDR2 and DDR3 RAM. These DDR1, DDR2 and DDR3 have different pin counts. The positions of notch are also different in each DDR. DIMMs can be both either single sided or double sided. DIMMs are based on DDR1, DDR2 or DDR3. DDR1 have data in it, but they don't have the strobe.

DDR2 have data as well as data strobe in it. DDR2 consumes power and voltage less than DDR1 and DDR3 consumes less power and voltage than DDR2, by giving same speed. There are different frequencies of data and strobe. For PC1600 the frequency is 200 MHz data and strobe / 100 MHz clock for address and control, for PC2100 the frequency would be 266 MHz data and strobe / 133 MHz clock for address and control, for PC2700 it would be 333 MHz data and strobe / 166 MHz clock for address and control, for PC3200 it would be 400 MHz data and strobe / 200 MHz clock for address and control.

DIMM DDR memory is the memory of integrated circuits which is commonly used in the computers. DDR1 SDRAM is superseded by DDR2 and it is further superseded by DDR3. The memory modules of DDR2 or DDR3 will not work correctly in DDR1 and the memory modules of DDR1 will not work appropriately in DDR2 or DDR3. The timings of electrical data and clock signals are strict in DDR which makes its transfer rate higher. To lower the clock frequency of DDR, double pumping is used.

RIMM DDR Memory has double data rate which means its bandwidth is double than SDR. The transfer rate of DIMM DDR memory is (memory bus clock rate) × 2 (for dual rate) × 64 (number of bits transferred) / 8 (number of bits/ byte). There are two specifications of DIMM DDR Memory. First one is for the memory chips and second one is for the modules of memory. The bus frequencies for data, address and control lines of DIMM DDR Memory are as following: for PC66 it would be 66 MHz, for PC100 it would be 100 MHz and for PC133 it would be 133 MHz.

Tips and comments

There are some of the differences between SIMM and DIMM. The contacts on SIMMs are redundant on both sides. In DIMM the contacts are electrically separate on each side of module. The data-path is of 32 bits in standard SIMMs. The data path in DIMMs is of 64 bit.

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