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What is SDRAM? SDRAM is an acronym for Synchronous Dynamic Random Access Memory. The term "Synchronous" externalharddrive means that the clock cycle of the memory is exactly synchronized with the clock cycle of the bus. Every calculation and operation a PC performs is timed according to a clock ticking millions of times each second, its clock cycle or megahertz rating. If the memory clock cycle is not in sync with the bus clock cycle, system problems will occur. What is Cache Memory? Cache, pronounced "cash", is a high-speed memory designed to supply the processor with the most frequently requested data and instructions. The information located in the cache memory can be accessed many times faster than information in the system''s main memory. The more information your system can retrieve from the cache memory, the more efficient the system will run. Level 1 (L1) cache, also referred to as Primary Cache, is normally located inside the CPU chip. Level 2 (L2) cache, also referred to as Secondary Cache, was normally located on the system board near the CPU in the past. In today''s systems, both are physically located within the CPU and as a result are not upgradable.

RAM comes in many different kinds of configurations and types-and runs at many different speeds, as well. Before you upgrade, you need to know how to externalharddrive spot the different types. Pictured in these steps are the different types of RAM, including the older-style DIPs and newer SIMMs externalharddrive and DIMMs. Step 1: Dual Inline Packages (DIPs) If you have an older computer, it might use an older kind of memory called a dual inline package (DIP). DIPs plug directly into their own sockets on the motherboard. It''s difficult to find DIPs today because they''re old. They come in pairs or sets of eight. Step 2: Single Inline Memory Modules SIMMs (Single Inline Memory Modules) plug into long, matching sockets on your motherboard. SIMMs have more capacity than DIPs. Typically, a motherboard has several banks of SIMM sockets into which you plug SIMMs. SIMMs come in 30-pin and 72-pin formats. 30-pin SIMMs usually have less capacity than 72-pin, and often come with capacities of 256K, 1MB, 2MB, and 4MB. 72-pin SIMMs come in 1MB, 2MB, 4MB, 8MB, 16MB, and 32MB. Step 3: Dual Inline Memory Modules

By upgrading your system''s video memory, the resolution on the computer''s monitor can be increased depending upon the limits of the monitor itself. Programs that are graphics intensive will also run faster and have a smoother appearance. Technical Support: 4 All Memory''s Technical Support Program goes beyond the lifetime warranty, routine calls and questions. As memory specialists for many years, we want to provide the most comprehensive level of service and support in the industry. Our Customer Support representatives can answer your questions and give you information on system/memory configurations, upgrade options, product specifications, externalharddrive compatibility and other technical topics or issues. 4 All Memory''s Customer Service Team is also here to provide help when you need it-everything from installation assistance to memory troubleshooting, repair or replacement. If you have a question related to memory or need assistance please call 1-800-566-3727 and a customer support representative will be available to help you.

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