Crucial CT25664AC800 2 GB DDR2 800 MHz (PC2-6400) CL6 SODIMM 200-Pin Memory

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DIMMs are often referred to as "single-sided" or " double-sided" to describe whether the DRAM chips are located on one or both sides of the module's printed circuit board (PCB). However, these terms may cause confusion, as the physical layout of the chips does not necessarily relate to how they are logically organized or accessed. https://www.google.com/books/edition/Peter_Norton_s_New_Inside_the_PC/O0FTac_k7CIC?hl=en&gbpv=1&dq=laptop+proprietary+sodimm&pg=PA36&printsec=frontcover a b c d e f g https://www.google.com/books/edition/Upgrading_and_Repairing_Laptops/xCXVGneKwScC?hl=en&gbpv=0

Razak Mohammed Ali. "DDR2 SDRAM interfaces for next-gen systems" (PDF). Electronic Engineering Times. Archived from the original (PDF) on 2007-09-26.Use a digital camera or smartphone set for close-up focusing so you can document the system’s interior before you start the upgrade process.

Ilya Gavrichenkov. "DDR2 vs. DDR: Revenge gained". X-bit Laboratories. Archived from the original on 2006-11-21. pin, with different notch position than on DDR4 SO-DIMMs, used for UniDIMMs that can carry either DDR3 or DDR4 SDRAM Capacity shouldn’t be an issue with modern hardware. It’s possible to get 32GB SODIMMs with DDR4 or DDR5 memory, which are not even costly. That allows for up to 64GB of RAM in a laptop with the standard two SODIMM slots, which should be more than enough for almost any task. Thermal Issues Double data rate 2 SDRAM (DDR2 SDRAM) is the successor to DDR SDRAM. DDR2 SDRAM runs its external data bus at twice the speed of DDR SDRAM and features a four-bit prefetch buffer, enabling faster performance. However, DDR2 SDRAM memory has greater latency than DDR SDRAM memory. Latency is a measure of how long it takes to receive information from memory; the higher the number, the greater the latency. Typical latency values for mainstream DDR2 memory are CL=5 and CL=6, compared to CL=2.5 and CL=3 for DDR memory. 240-pin memory modules use DDR2 SDRAM.

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SODIMMs are slightly smaller modules than DIMMs. These are almost half the size of DIMM modules, which are 67.6 mm (2.66 inches) in size. The width of the modules is the same. SODIMMs are designed to be used in notebooks and laptops and have fewer pins while maintaining the same functionality as DIMMs.Depending on the specific module and motherboard chipset combination, PC133 modules can sometimes be used on systems that are designed for PC100 modules. DDR SDRAM For critical applications, network servers have long used a special type of memory called error-correcting code (ECC). This memory enables the system to correct single-bit errors and notify you of larger errors. Memory Upgrade Considerations—This section lists the many different factors you need to take into account when selecting RAM for a particular system. If you are installing memory in a system that uses single-sided modules (8 or 9 chips), don’t install double-sided modules (16 or 18 chips) as additional or replacement RAM unless you verify they will work in that system. Installing Memory

Computer memory module Two types of DIMMs: a 168-pin SDRAM module (top) and a 184-pin DDR SDRAM module (bottom). The SDRAM module has two notches (rectangular cuts or incisions) on the bottom edge, while the DDR1 SDRAM module has one. Also, each module has eight RAM chips, but the lower one has an unoccupied space for the ninth chip; this space is occupied in ECC DIMMs. Three SDRAM DIMM slots on a ABIT BP6 computer motherboard DDR SODIMM: The original DDR (Double Data Rate) SODIMM, providing improved data rate over earlier SDRAM SODIMMs. SODIMMs started out with 144 pins, but now have a 262-pin configuration in a DDR5 module. MicroDIMM RAM Configurations—Discover how multi-channel memory layouts available on many systems can boost performance and how to install the modules. Variety of Capacities and Speeds: SODIMMs are available in a range of capacities and speeds, allowing users to choose the memory configuration that best meets their needs.Before working with any memory modules, turn the computer off and unplug it from the AC outlet. Be sure to employ electrostatic discharge (ESD) protection in the form of an ESD strap and ESD mat. Use an antistatic bag to hold the memory modules while you are not working with them. Before actually handling any components, touch an unpainted portion of the case chassis in a further effort to ground yourself. Try not to touch any of the chips, connectors, or circuitry of the memory module; hold them from the sides. Ever-increasing amounts of RAM are needed as operating systems and applications get more powerful and add more features. Because RAM is one of the most popular upgrades to add to any laptop or desktop system during its lifespan, you need to understand how RAM works, which types of RAM exist, and how to add it to provide the biggest performance boost to the systems you maintain. Smith, Ryan (2020-07-14). "DDR5 Memory Specification Released: Setting the Stage for DDR5-6400 And Beyond". AnandTech . Retrieved 2020-07-15. While DDR SDRAM is sometimes rated inMHz, it is more often rated by throughput (MBps). Common speeds for DDR SDRAM include PC1600 (200MHz/1600Mbps), PC2100 (266MHz/2100Mbps), PC2700 (333MHz/2700Mbps), and PC3200 (400MHz/3200Mbps), but other speeds are available from some vendors. DDR2 SDRAM