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RAM (random access memory) is put on your computer using RAM chips placed into special slots. When your computer is turned off, RAM is empty-unlike a hard disk, it can''t store data unless the RAM is powered by electricity. Step 2: RAM''s Power Source When you turn your computer on, electricity flows from the power supply to the motherboard. Because the RAM is directly attached to the motherboard, it gets electricity from the motherboard. When RAM is powered by electricity, it can store data. Step 3: RAM and Hard Disk Relationship The data is now in memory and can be used, manipulated, and altered. The altered data stays in RAM only until you issue a command to save it. When you issue a Save command, the altered data is sent back over the bus to your hard disk, and the data is stored there. When you turn your computer off, the data vanishes out of RAM, but stays permanently on your hard disk.

4 All Memory.Com warrants that all products are free from defective material and workmanship and, subject to the conditions set forth below, agrees to repair or replace any part of a product that proves defective by reason of improper workmanship or materials without charge for parts and labor. Memory Lifetime free replacement of defective modules with 4AllMemory.com. 30-Day money back on all memory products. No credit or refund after 30 days. Customer agrees to assume shipping charges on return shipments to 4 All Memory and 4 All Memory agrees to assume shipping charges back to customer. Lifetime is defined as the lifetime of the product on the market. Outdated technology is not covered by lifetime warranty if the item is no longer available on the common market as a new product.

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 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, 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.