Unformatted text preview: MEMORY
By: Lawrence Johns CBIS 3211 The Basics Memory, which is commonly referred to as RAM and ROM, is essential to the functioning of a system. When most people mention memory, RAM comes to mind first. Two Types of Memory Nonvolatile Stored on chips located directly on the system board ROM Volatile Stored on DIMMs, SIMMs, or RIMMs RAM RAM RAM is the working memory storage. All the data, which the PC uses and works with during operation, is stored here. Since RAM was invented in 1968, it has come a long way in meeting the needs of today's demanding computer users. Fast page mode RAM or FPM RAM was the most common type used until 1995. Several other types of RAM followed FPM RAM: EDO (Extended Data Out) SD RAM (Synchronous DRAM) DDR and DDR2(Double Data Rate SD RAM) RD RAM (Rambus DRAM) Historic Types of RAM EDO A type of RAM chip that was designed to utilize the potential of the first Intel Pentium processors. Up to 20 MHz clock speed. SD RAM Type of RAM that synchronizes itself with the CPU clock to maximize performance. Available in 66, 100, and 133 MHz speeds. Today's RAM Most computers today use either DDR or DDR2 RAM. Systems equipped with the latest processors usually use DDR2 while some of the notasrecent use DDR. Memory Speed Today's memory runs at speeds compatible with the CPU clock speed. DDR RAM has bus clock speeds of 100 and 133 MHz. RD RAM comes in speeds of 66, 100, 133, 200, and 266 MHz. Cost of RAM Since the capacity of memory has skyrocketed, the prices have fallen and become very competitive. A 512 MB stick of DDR RAM will cost you around $120. A 512 MB stick of RD RAM will cost you around $150. End Questions? ...
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- Fall '04
- Clock rate, DIMM, DDR SDRAM, FPM RAM, SD RAM