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Do I need to upgrade the memory modules in my PC systems in pairs? So, if a system uses an 8 bit word, it would need 1 bit for parity checking, but 5 bits for ECC. However, a 32 bit word needs 4 bits for parity or 7 bits for ECC. Increase the bandwidth to 64 bits and 8 bits are required for both parity or ECC. As you can see, at the 64 bit level, it is equally efficient to use ECC or parity. This is how manufacturers use 36 bit memory modules in groups of 2 or more to create an ECC environment.
Compaq's Tri-Flex memory bus is such a system. Since the 4 modules have 16 spare bits between them, the 9 bits needed for ECC are easily satisfied.
Other systems may use special ECC memory modules, but the cost benefit and availability of industry standard 36 bit SIMMs appeals to designers and end-users. How is ECC used in the real world? Systems that use ECC, may use it differently. Usually, when data requires correction, the operating system logs the error and reports the error to the system administrator. Multiple errors may be reported for the same memory location, if the data is read more than once without being replaced by different data.
If the same memory location is corrected after a system powerdown, a defect is most likely present in the memory and should be replaced. Post Reply. Top Contributor. Dell Support Resources.
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