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DIMMs (Dual Inline Memory Modules) look a lot like SIMMs, but they come in a 168-pin format. They are usually a faster and higher-performance memory than SIMMs, and memorysticksony are used in Pentium PCs. They come in capacities ranging from up to 64MB and beyond. Step 4: Parity Versus Non-Parity Chips A SIMM or DIMM usually has nine chips of memory on it. Eight of those chips are used for the memory itself. The ninth chip is called a parity chip. The parity chip is used for error checking, memorysticksony to make sure that the other chips aren''t making any errors. Some computer systems require parity chips, while others do not. In general, Pentium-based computers and certain 486s don''t require parity memory. Parity memory usually costs more than non-parity memory. Check your PC or motherboard''s manual to see which kind of memory your PC requires.

You can think of RAM as an incredibly memorysticksony fast hard drive that stores information temporarily instead of permanently. When you start a program it is loaded from the hard drive into RAM. When a program is running in RAM it can run hundreds to thousands of times faster than it can if run directly from the hard drive. The problem is that the capacity of a standard hard drive is many times the size of a computer''s RAM size, meaning it is possible to load so many programs that the RAM can no longer hold them. When that happens, your computer''s virtual memory kicks in, and that''s bad. Virtual memory is simply your hard drive trying to act like a RAM chip. Since the hard drive is so much slower than real memory, programs stutter and sometimes crash when the hard memorysticksony drive has to do a job it was never designed for. There are only two solutions to this problem: close some programs until virtual memory is no longer needed, or add more physical memory. If you can afford it (and current memory prices are low enough that practically anyone should be able to), the latter solution memorysticksony is always preferable.

The last step upon leaving the case should always be to ensure that every cable memorysticksony and power plug is fully seated. memorysticksony If this also does not resolve the problem, try just the new module alone in the system to determine if it memorysticksony is compatible with your system. If the system boots with just the new module, try shutting down and adding the other modules one by one to determine if there may be a chipset incompatibility. What is the difference memorysticksony between ECC and non-ECC (non-parity) memory? If you are unsure of which type you have, just count the number of small black chips on one of your existing memory modules. If the number of chips divides by three evenly, then you need ECC. If the number of chips is does NOT divide evenly by three, you have non-ECC or non-parity memory. If you plan to use your system as a server or a similar mission critical type machine, you may want to take advantage of ECC. If you plan to use your system for regular home, office, or gaming applications, you are better off with non-ECC. Current technology DRAM is very stable and memory errors are rare, so unless you have a need for ECC, you are better served with non-parity SDRAM.

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