Notebook computersExplanationSmall outline dual in-line memory modules (SODIMM) is a compact form factor of DIMM. It is typically used in smaller computers such as notebooks.

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DIMMExplanationA DIMM (dual in-line memory module) has pins on both sides of the module, with each pin being unique. A SODIMM (small outline dual in-line memory module) is a smaller DIMM used in laptops. PATA (Parallel ATA) and SATA (Serial ATA) are storage device interfaces. AGP (Accelerated Graphics Port) is a video card expansion bus.
333 MHzExplanationDDR2 memory rated at PC2-5300 has a bus speed of 333 MHz and an internal frequency of 667 MHZ (or DDR2-667). The bandwidth is around 16 times the bus speed and 8 times the DDR- designation. for DDR2, the PC2- designation identifies the bandwidth instead of a number derived from the bus speed. For DDR, DDR2, DDR3, and DDR4 the number following the DDR-designation is always twice that of the bus speed, specifying that the double data rate memory transfers double the data in a single clock cycle. This means that DDR2-667 has a bus frequency (speed) of 333 MHz.
DDR3-1600ExplanationDDR3-1600 has the fastest memory rating. It has a bus frequency of 800 MHz and bandwidth of 12800 MB/s. For DDR, DDR2, DDR3, and DDR4, the number following the DDR designation is always twice that of the bus speed, specifying that the double data rate memory transfers double the data in a single clock cycle. This means that DDR2-667 has a bus frequency of 333 MHz. The older PC designation identified the bus frequency, so PC-133 has a frequency of 133 MHz. The newer PC- designation identifies the bandwidth, so PC-2700 has a bandwidth of 2700 MB/s. To get the frequency from the bandwidth, divide the bandwidth by 16, giving you 166 MHz for PC-2700 and 200 MHz for PC-3200.
DDR3-2000ExplanationDDR3-2000 has the fastest memory rating. It has a bus frequency of 1000 MHz and a bandwidth of 16000 MB/s. For DDR, DDR2, DDR3, and DDR4, the number following the DDR-designation is always twice that of the bus speed, specifying that the double data rate memory transfers double the data in a single clock cycle. This means that DDR-400 has a bus frequency of 200 MHz. The newer PC-designation (used with all DDR2 and DDR3 memory) identifies the bandwidth, so PC3-8500 has a bandwidth of 8500 MB/s. To get the frequency from the bandwidth, divide the bandwidth by 16, giving you 533 MHz for PC3-8500 and 667 MHz for PC3-10600.
DDR3 doubes the data transfer rate of DDR2. DDR3 uses less power than DDR2.ExplanationDDR3 doubles the data transfer rate of DDR2 and generally requires less voltage than DDR2 memory. DDR3 accepts eight consecutive 64-bit words per bus clock cycle, not four as found in DDR2. Both DDR2 and DDR3 memory includes a buffer between the data bus and the memory.
DDR ExplanationDouble Data Rate-Synchronous Dynamic RAM (DDR) has 184 pins in a dual in-line memory module (DIMM) form factor. Extended Data Out (EDO), Fast Page Mode (FPM) and SDRAM are available in a 168-pin DIMM form factor and are interchangeable with each other.
A customer needs to use several application. Currently, the computer cannot keep all the necessary applications open at the same time. Which of the following components should you consider upgrading?
MemoryExplanationWhen an application is started, it is loaded into memory. If the computer does not have sufficient memory, the application cannot start. To remedy the problem, add more memory to the computer. Upgrade the hard disk to provide additional storage space for files. Upgrade the CPU to execute programs faster or to provide advanced processing features. Upgrade the system board to support new components, such as newer memory modules, CPUs, or bus types.
DDR4 doubles the data transfer rate of DDR3.DDR4 uses less power than DDR3.ExplanationDDR4 doubles the data transfer rate of DDR3 and generally requires less voltage than DDR3 memory. DDR4 accepts eight consecutive 64-bit words per bus clock cycle, the same as found in DDR3. Both DDR3 and DDR4 memory includes a buffer between the data bus and the memory.
512 GBExplanationDDR4 theoretically allows for DIMMs of up to 512 GB in capacity. DDR3 has a theoretical capacity of 128 GB per DIMM.
UniDIMMExplanationUniDIMM (Universal DIMM) is a specification for DIMMs and is designed to carry DRAM chips. UniDIMMs can be populated with either DDR3 or DDR4 chips, but do not support any additional memory control logic. Because of this, the computer"s memory controller must support both DDR3 and DDR4 memory standards. UniDIMM:Is an upgrade to the current SODIMM standard.Allows mobile platform users to use both DDR3 and DDR4.

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The memory modules have the following characteristics:DDR (Double-Data Rate Synchronous Dynamic RAM) DIMM: Has a single notch, slightly off center. DDR memory has 184 pins.DDR2 DIMM: Has a notch slightly closer to the middle and has more pins (240) than DDR memory.DDR3 DIMM: Has a single notch that is more off-centre than the notch for DDR or DDR-2. Like DDR2, DDR3 has 240 pins. DDR4 DIMM: Has a single notch slightly right of centre. DDR4 has 288 pins.144-pin SODIMM: Used in notebook computers. The notch is slightly off cente. They are used by SDRAM, DDR, and DDR2 memory. 200-pin SODIMM: Also used in notebook computers. The notch is father off centre than 144-pin SODIMM. They are used by DDR2 and DDR3 memory.UniDIMM: Also used in notebook computers. The notch is positioned similar to 200-pin SODIMM. UniDIMM supports both DDR3 and DDR4 memory.
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