6/21/2023 0 Comments Cpusim instruction memory![]() ![]() ![]() Although a few systems can use more than one memory module form factor, in most cases if you want to change to a faster type of memory module, such as from 184-pin DIMM (used by DDR SDRAM) to 240-pin DIMM (such as DDR2 or DDR3 SDRAM), you need to upgrade the motherboard first. Memory module form factor (240-pin DIMM, 184-pin DIMM, 168-pin DIMM, 204-pin SO-DIMM, and so on)-The form factor your system can use has a great deal to do with the memory upgrade options you have with any given system. When you must specify memory for a given system, there are several variables you need to know: Foundation Topics Memory Upgrade Considerations Installing Memory-Laptops and desktops differ in how memory is installed, as you learn in this section. RAM Compatibility-Learn how to make sure additional memory works with existing memory in this section. Single-Sided vs Double-Sided-Learn what these terms mean and how they might affect how much RAM you can install on a particular system. RAM Configurations-Discover how multi-channel memory layouts available on many systems can boost performance and how to install the modules. SO-DIMM vs DIMM-In this section, you learn the differences between memory modules made for desktop and those made for laptop computers. 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. Memory Upgrade Considerations-This section lists the many different factors you need to take into account when selecting RAM for a particular system. This chapter covers the following subjects: 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.Ģ20-901: Objective 1.3 Compare and contrast various RAM types and their features. ![]() Although RAM’s contents are temporary, RAM is much faster than magnetic or SSD storage RAM speed is measured in nanoseconds (billionths of a second), while magnetic and SSD storage is measured in milliseconds (thousandths of a second).Įver-increasing amounts of RAM are needed as operating systems and applications get more powerful and add more features. Although the contents of RAM and mass storage can be changed freely, RAM loses its contents as soon as you shut down the computer, while magnetic storage can hold data for years. Although the hard drive can substitute for RAM in a pinch, don’t confuse RAM with mass storage devices such as hard disks or SSDs. If your computer runs short of RAM, the operating system can also use the hard drive as virtual memory, a slow substitute for RAM. Thus, installing more RAM improves transfers between the CPU and both RAM and hard drives. RAM is used for programs and data as well as by the operating system for disk caching (using RAM to hold recently accessed information). Arrangements are by Stetson’s Funeral Home in Brunswick, where condolences, memories, and photos may be shared.CompTIA A+ 220-901 and 220-902 Cert Guide, Academic Edition Allen is survived by his closest living relative, his first cousin Beverly Prosser Gelwick of Harpswell.īurial with full military honors will be held at the New Maine Veterans’ Memorial Cemetery in Augusta, on Tuesday, July 18, at 1:00 p.m. He enlisted in the US Naval Reserve in Boston in October 1940. He was awarded a Purple Heart for his bravery.Īllen, we are told, had “hoped to eventually have a career in the hotel restaurant service spent seven summers working at the Bethel Inn, Bethel, Maine.”īefore attending Bowdoin, he spent a year as a cadet at the United States Military Academy in West Point, NY. The majority of his "unknown" shipmates have now also been identified.Ī Maine native, Allen was born in 1916, and, according to an obituary published in The Portland Press Herald, was serving with the observation squadron on the Oklahoma when he was killed. In June 2021, thanks to advances in forensic technology, the Defense POW/MIA Accounting Agency (DPAA) identified the remains of Ensign Allen, and he will soon be heading to his final resting place. As was the case with most of the 429 men on the ship who were killed in the Japanese attack on Pearl Harbor, Allen’s remains lay unidentified for nearly eight decades, buried as “unknowns” in a Honolulu cemetery. ![]()
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