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

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This all makes it harder to cool the RAM. This hasn’t been a massive issue in the p. Still, thermal management will get more complex as RAM speeds increase and the power management moves onto the SODIMM with DDR5. This will likely mean SODIMMs working on the lower end of the JEDEC standardized speeds. However, most use cases will see only a minimal difference with RAM speed changes. 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. 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 Higher-speed DDR2 DIMMs can be mixed with lower-speed DDR2 DIMMs, although the memory controller will operate all DIMMs at same speed as the lowest-speed DIMM present. Installing Memory—Laptops and desktops differ in how memory is installed, as you learn in this section. Foundation Topics Memory Upgrade Considerations

Full-height 288-pin DDR4 DIMMs are slightly taller than their DDR3 counterparts at 1.23 inches (31mm). Similarly, VLP DDR4 DIMMs are also marginally taller than their DDR3 equivalent at nearly 0.74 inches (19mm). [15] User Upgradeable: Many laptops and SFF machines have user-accessible memory slots, making it relatively straightforward to upgrade the memory by replacing or adding SODIMMs. RAM Types—This section provides the information you need to understand memory chip and module types and how some types of memory are designed to correct memory errors. a b https://www.google.com/books/edition/Upgrading_and_Repairing_PCs/E1p2FDL7P5QC?hl=en&gbpv=1&dq=simm+32+bits+dimm+64+bits&pg=PA442&printsec=frontcover 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.Compact Size: SODIMMs are more compact than regular DIMMs, making them suitable for use in laptops and other small form factor machines. MicroDIMMs started out with 144 pins and now have 214 pins on the same form factor module. DIMM VS. SODIMM VS. MicroDIMM: A Comparison DIMM, SODIMM, MicroDIMM DDR2 Size Comparison 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.

JEDEC standard: DDR2 SDRAM Specification: JESD79-2F, November 2009 ** http://www.jedec.org/standards-documents/docs/jesd-79-2eAccording to JEDEC [5] the maximum recommended voltage is 1.9 volts and should be considered the absolute maximum when memory stability is an issue (such as in servers or other mission critical devices). In addition, JEDEC states that memory modules must withstand up to 2.3 volts before incurring permanent damage (although they may not actually function correctly at that level). Some manufacturers label their DDR2 modules as PC2-4300, PC2-5400 or PC2-8600 instead of the respective names suggested by JEDEC. At least one manufacturer has reported this reflects successful testing at a higher-than-standard data rate [9] whilst others simply round up for the name. 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. Memory Upgrade Considerations—This section lists the many different factors you need to take into account when selecting RAM for a particular system. Look for the “Form Factor” to know your module’s size. View the memory module’s form factor in Task Manager

Most desktop computers use full-sized memory modules known asDIMMs. However, laptop computers and some small-footprint mini-ITX motherboards and systems use reduced-size memory modules known as small outline DIMMs (SO-DIMMs or SODIMMS).Estimated delivery times are provided to us by the respective delivery companies. We pass this information onto you, the customer. Double data rate 3 SDRAM (DDR3 SDRAM) Compared to DDR2, DDR3 runs at lower voltages, has twice the internal banks, and most versions run at faster speeds than DDR2. DDR3 also has an eight-bit prefetch bus. As with DDR2 versus DDR, DDR3 has greater latency than DDR2. Typical latency values for mainstream DDR3 memory are CL7 or CL9, compared to CL5 or CL6 for DDR2. Although DDR3 modules also use 240 pins, their layout and keying are different than DDR2, and they cannot be interchanged. The table below summarises the three common form factors of memory modules used in tech gadgets today: Like the DIMM form factor, no generation of SODIMM form factored RAM is compatible. This is because the form factor is essentially the only difference between DIMM and SODIMM. There aren’t any performance impacts beyond increased thermal constraints and physical capacity limits inherent to the smaller form factor. SPECIALITY DDR2-1066 SDRAM" (PDF). JEDEC. November 2007: 70 . Retrieved 2009-03-14. {{ cite journal}}: Cite journal requires |journal= ( help)