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

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One of the most significant issues with small form factor computers, especially laptops, is thermal constraints. It can be difficult to dissipate heat from such a small area, especially with the limited airflow. To make it even worse for SODIMM memory. Laptops typically only allocate the required space, meaning there’s no room for a large heat sink like you find on full-size DIMMs. 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.

Like desktop DIMMs, SODIMMs have also increased the number of pins over time. SDR SODIMMs had 144 pins, while DDR and DDR2 used 200 pins. DDR3 upped the pin count to 204, while DDR4 increased that to 260 and DDR5 to 262. This further ensures electrical incompatibility between generations of SODIMM memory. Where Are SODIMMs Used?Samsung Electronics Announces JEDEC-Compliant 256Mb GDDR2 for 3D Graphics". Samsung Electronics. Samsung. 23 August 2003 . Retrieved 26 June 2019. DDR2's bus frequency is boosted by electrical interface improvements, on-die termination, prefetch buffers and off-chip drivers. However, latency is greatly increased as a trade-off. The DDR2 prefetch buffer is fourbits deep, whereas it is twobits deep for DDR. While DDR SDRAM has typical read latencies of between two and three bus cycles, DDR2 may have read latencies between three and nine cycles, although the typical range is between four and six. Thus, DDR2 memory must be operated at twice the data rate to achieve the same latency. Estimated delivery times are provided to us by the respective delivery companies. We pass this information onto you, the customer. 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 Configurations—Discover how multi-channel memory layouts available on many systems can boost performance and how to install the modules. Look for the “Form Factor” to know your module’s size. View the memory module’s form factor in Task ManagerDDR2 SDRAM was first produced by Samsung in 2001. In 2003, the JEDEC standards organization presented Samsung with its Technical Recognition Award for the company's efforts in developing and standardizing DDR2. [1]

Figure 4-2 A standard unbuffered module (top) compared to a buffered (registered) module with ECC (bottom). pin, used for SDR SDRAM (less frequently for FPM/EDO DRAM in workstations/servers, may be 3.3 or 5 V) DDR4 SODIMM: The latest iteration, providing further improvements in data rate and power efficiency over DDR3 SODIMMs.

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DIMMs are the memory modules you see inside desktop computers. They are relatively larger in size than the SODIMM and MicroDIMM modules. These are 133.35 mm (5.25 inches) in length. Mueller, Scott (March 7, 2013). "Upgrading and Repairing PCs: Upgrading and Repairing_c21". Que Publishing – via Google Books. To keep each generation of SODIMM distinct and prevent hardware damage caused by the different voltage requirements between generations, each generation of SODIMM RAM uses a different cut-out “key.” The key position between DDR and DDR2 SODIMM memory was very similar. Making them hard to tell apart outside direct side-by-side comparisons. Other generations of SODIMM RAM have more distinct key locations. Are DDR, DDR2 and DDR3 SO-DIMM memory modules interchangeable?". acer.custhelp.com . Retrieved 2015-06-26. 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.

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 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 The small volume of the SODIMM form factor makes them ideal for use in computers with unusually constrained space. As you might have gathered from the intro, SODIMMs are primarily used in laptops. Not all laptops use SODIMM memory, though. As much as it is convenient for users that want the option to upgrade RAM in the future. It’s slightly more complex and expensive to implement than simply soldering the RAM chips directly onto the motherboard. Similar to what you would see on a mobile phone. Note: DDR2-xxx denotes data transfer rate, and describes raw DDR chips, whereas PC2-xxxx denotes theoretical bandwidth (with the last two digits truncated), and is used to describe assembled DIMMs. Bandwidth is calculated by taking transfers per second and multiplying by eight. This is because DDR2 memory modules transfer data on a bus that is 64 data bits wide, and since a byte comprises 8 bits, this equates to 8 bytes of data per transfer. 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.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]