DRAM is manufactured as a chip, a small piece of semiconducting material that contains a series of imbedded circuits and millions of memory cells. Like the other components in a computer, memory has significantly improved over time. Newer computers use different kinds of memory than their predecessors. So memory manufacturers must produce a wide range of products for both new and old computers. But remember, this number is in mega bits .
Parity is a method used to check the integrity of data stored in memory.
Parity-enabled memory modules check for memory errors by adding an extra bit of data to each byte of data to make the sum of the segment either odd or even. Remember, computer data consists of combinations of 1's and 0's. This sum is recalculated as the byte leaves memory on its way to the CPU . If the sum has changed, a memory error is generated, indicating that data may have been lost or corrupted. Because memory errors are rare, manufacturers also offer products without parity.