46C7420 IBM Memory Module

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Product Number: 46C7420 *

*Click Part Number to Buy or For Pricing Info

Brand: IBM

Description: New/NIB New 8GB 2 x 4GB - 667MHz DDR2-667/PC2-5300 - ECC - DDR2 SDRAM Memory - 24 Weight 0.25 lbs. New Manufacturers Warranty

More Product Info on 46C7420

SDRAM and its significance

SDRAM stands for Synchronous dynamic random access memory. SDRAM devices are synchronised to system bus and it waits to sync with system bus before responding to the input controls. This enables SDRAM to function at higher speeds than DRAM. SDRAM cards are widely used in computers.

DDR, DDR2 and DDR3 are generations of memory modules than have been developed from SDRAM. SDRAM has auto refresh feature which allows refresh the data without physically removing the device from the computer. SDRAM also has a low power mode. SDRAM is relatively a slower version than DDR as the SDRAM chip only transmits single word of data per clock cycle.

The initial SDRAM was also called Single Data Rate SDRAM also known as SDR SDRAM. A double data interface was developed for SDRAM modules which enable to transfer two data words in a single clock cycle so that the device can perform with high speed transfers. This was named as DDR SDRAM.

DRAM modules and its significance

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.

DDR3 SDRAM and its advantages over previous versions

DDR in DDR3 stands for Double Data Rate. It is the latest memory standard for hispeed SDRAM that we use in our computers. DDR3 is a improved version of DDR2 in many aspects. DDR3 Ram is a type of DRAM. DDR3 shows a lesser power consumption of 30 percent and also a lower operating voltage when compared to DDR2.

Lesser power consumption means less amount of heat generated. So, the cooling needs of DDR3 are less than DDR2. DDR3 Ram is not forward or backward compitable with any type of other RAM as the operating voltages, clock speeds, timing and several other factors.

DDR3 memory has a high bandwidth interface. In addition to all these advantages, DDR3 memory type also provides the facility of having up to 8 Gigabites of memory on board. DDR3 RAM modules have different notch positions to DDR2 to prevent accidental insertion of DDR3 memory in to DDR2 slots.

Types of Computer Memories

We have come a long way from the days when heavy tape drives were used to store information to hand held little devices available today. Computer memory is nothing but the collection of data on physical devices in a digital format i:e 0's and 1's.

To classify memory, there are two types broadly, one is volatile and the other is non volatile. As their name suggests, volatile memory can store information only till it is supplied with electric energy and non volatile memory can retain the information even after the supply is disconnected.

In present day computers, RAM is a volatile but high speed memory, while Hard Drives are non volatile but low speed memory. There are many types of volatile and non volatile memories that have been developed. Among them, Different types of RAM like SDRAM, DDR, DDR2, DDR3 etc stand for volatile and flash drives, hard disks and optical storage devices are a few types that come under the non volatile category.

Want To Buy DDR3 SDRAM?

DDR3 SDRAM is the latest technology or model of RAM. It reduces heat and power consumption. Its clock speed is higher (faster) than that of DDR2 memory and other DDR memory products. Since DDR3 RAM runs at a higher clock speeds as mentioned previously this will make all components within the processor and graphics card run faster and benefit from receiving information at a faster rate. Therefore DDR3 RMA memory works more efficiently, giving a boost to frame rates while gaming. It also transfers data at twice the rate (eight times the speed of its internal memory arrays). It can enable higher bandwidth. DDR3 SDRAM gives a transfer rate of (memory clock rate) × 4 (for bus clock multiplier) × 2 (for data rate) × 64 (number of bits transferred) / 8 (number of bits/byte). Thus with a memory clock frequency of 100 MHz, DDR3 SDRAM gives a maximum transfer rate of 6400 MB/s. In addition, the DDR3 standard permits chip capacities of up to 8 gigabytes.