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As noted in the introduction, there''s a virtual alphabet soup of memory types: SDRAM, EDO, FPM, SIMM, and DIMM. It certainly can create a great deal of confusion. RAM itself stands for "random access memory," meaning the CPU can access any memory address without reading all addresses before it. (ROM—read only memory—is random access, too, but you can''t write to it). It gets worse, because memory comes in different speeds, and some types don''t work in some systems. Here''s the rundown on the three memory types used in today''s systems.... SDRAM. Synchronous DRAM SDRAM''s speed is typically measured in MHz (for example, 100MHz), although you do see references to 10ns SDRAM ("ns" stands for nanosecond or one billionth of a second). SDRAM for PCs comes in DIMMs. These refer to SDRAM DIMMs rated at different memory bus speeds. For any CPU running at a 100MHz bus speed you should get SDRAM. Some future motherboards will support SDRAM. Although there''s a price premium, SDRAM will run in a PC100 system.

How do you know it''s time for a memory upgrade? There are several signs indicating it may be time to upgrade your memory. If you see your mouse pointer turn into an hourglass for significant periods of time, if you hear your hard drive working, or if your computer seems to work more slowly than you expect, the reason is probably insufficient memory. When the memory is full, your system transfers data to the hard drive. This is called swapping. Since the hard drive is considerably slower than DRAM, your system seems slower altogether. don''t know the model number of my computer, how can I get the right RAM? Please provide the following information in order to determine what memory you need. You can send it in an email to support@4allmemory.com. How many memory slots do you have? (It will generally be 2, 3 or 4) How many sticks of memory do you have in it now? How much memory is currently installed? (i.e. 16MB, 32MB etc..) What is the length of one stick of memory? (It will generally Please provide all of the numbers off of any stickers on a piece of memory. Look at one of the little black chips on the memory stick and provide all of the numbers off of one chip. (it is generally easier to read the chip numbers if you hold it under a bright light)

FEATURES RAM comes in the form of a chip, and to increase memory, you simply plug additional chips in to slots on your computer''s main board. The capacity of a RAM chip is measured in megabytes, or millions of bytes. Most systems now come with 48MB of RAM and up. You should have at least 32MB of RAM for running Windows, but with the ever-growing demand for memory, 64 MB or higher is ideal. BUYING TIPS Before buying additional memory for your computer, consult the hardware manual that came with your computer. The manual will tell you what kind of memory is required for your system. It is also important to check the number of RAM slots in your computer, as there is a limited number on the main board for installing memory (anywhere from two to eight). You can only install as many memory modules as you have slots, so plan ahead. If you want to add or upgrade to 128MB of RAM, for instance, get a single 128MB RAM chip, not two 64MB modules. This will save you one RAM slot for future expansion.