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

Product Information

DDR5 was introduced in 2021, and is the most recent generation of memory technology, marking a revolutionary jump in architecture. It’s arguably the biggest jump in memory technology we’ve seen since SDRAM. The maximum capacity on commercially available DDR2 DIMMs is 8GB, but chipset support and availability for those DIMMs is sparse and more common 2GB per DIMM are used. [ citation needed] [3] History [ edit ] 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. Full-height 240-pin DDR2 and DDR3 DIMMs are all specified at a height of around 1.18 inches (30mm) by standards set by JEDEC. These form factors include 240-pin DIMM, SO-DIMM, Mini-DIMM and Micro-DIMM. [14]

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. Standardized Dimensions: The dimensions and pin configurations of SODIMMs are standardized by JEDEC, the organization that develops standards for the microelectronics industry.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. https://media-www.micron.com/-/media/client/global/documents/products/data-sheet/modules/parity_rdimm/htf36c256_512_1gx72pz.pdf?rev=e8e3928f09794d61809f92abf36bfb24 [ bare URL PDF] After a memory word is fetched, the memory is typically inaccessible for an extended period of time while the sense amplifiers are charged for access of the next cell. By interleaving the memory (e.g. cells 0, 4, 8, etc. are stored together in one rank), sequential memory accesses can be performed more rapidly because sense amplifiers have 3 cycles of idle time for recharging, between accesses. If you have been in the tech industry for a while, you will know that there are different types and sizes of RAM/memory modules available. When referring to RAM sizes, we mean its physical size, and not its capacity (4 GB, 16 GB, etc.).

When it comes to memory, compatibility is important. The memory module type must fit the motherboard; speed must be compatible and the module storage size/combination must match your computer system as well. Mueller, Scott (March 7, 2013). "Upgrading and Repairing PCs: Upgrading and Repairing_c21". Que Publishing – via Google Books. Memory Upgrade Considerations—This section lists the many different factors you need to take into account when selecting RAM for a particular system. 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

Physical Appearance

In this article, we are going to talk about the different form factors of RAM modules and how they are distinct from one another. RAM Form Factors DIMM

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. RAM Configurations—Discover how multi-channel memory layouts available on many systems can boost performance and how to install the modules. For use in computers, DDR2 SDRAM is supplied in DIMMs with 240 pins and a single locating notch. Laptop DDR2 SO-DIMMs have 200 pins and often come identified by an additional S in their designation. DIMMs are identified by their peak transfer capacity (often called bandwidth). RAM systems are industry-wide standardized, so you need to know the electrical parameters and physical shape of the memory hardware installed in your computer. Because the electrical parameters are different for each generation of memory, the physical form of the memory changes to prevent the wrong memory from being installed in a computer. For example, choosing between SDRAM vs DDR5 isn't possible as motherboards can only use a particular memory specification. Some forms of memory are cross-compatible, but your system will only work with the appropriate RAM.DDR SODIMM: The original DDR (Double Data Rate) SODIMM, providing improved data rate over earlier SDRAM SODIMMs. a b c d e f g https://www.google.com/books/edition/Upgrading_and_Repairing_Laptops/xCXVGneKwScC?hl=en&gbpv=0 The above example applies to ECC memory that stores 72 bits instead of the more common 64. There would also be one extra chip per group of eight, which is not counted. Memory chip type used on the module (SDRAM, DDR SDRAM, and so on)—Today, a particular memory module type uses only one type of memory. However, older memory module types such as early 168-pin DIMMs were available with different types of memory chips. You need to specify the right memory chip type in such cases to avoid conflicts with onboard memory and provide stable performance.