Fix Memory Parity Errors

This post discusses the extensive study in determining the causes of some NMI memory parity errors in Windows with the aid of a high tech SIMM tester. The results are not conclusive, and the research into this is ongoing.

Both IBM OS/2 2.x and Windows seem to experience problems that appear to be associated with system memory in some circumstances. It can be frustrating to have a system that is able to run DOS, Windows 3.1, or OS/2 1.x and suddenly find it cannot run Windows due to this problem. The first issue to clear up is that not all NMI errors are due to memory. Other boards in the system can cause this problem, and components directly on the system motherboard can be at fault.

The memory is not functioning at the specified access rate as required by the system board. If the system specification calls for 80 ns access rate, Windows most likely fails if memory is accessing at a slower rate such as 90 ns. Even though the chips may be marked as 80 ns, in testing, some fail to meet this access rate. Quite often memory chips run at a slower speed when they reach operating temperature. This produces an effect called “speed drift.” The symptoms are a system which runs Windows when first turned on; however, after 15 minutes or so, the system starts having memory errors. A high quality SIMM tester can cycle the chips through various voltage and heat cycles, so this is fairly easy to see.

The memory is not functioning at the specified access rate as required by the system board. If the system specification calls for 80 ns access rate, Windows most likely fails if memory is accessing at a slower rate such as 90 ns. Even though the chips may be marked as 80 ns, in testing, some fail to meet this access rate. Quite often memory chips run at a slower speed when they reach operating temperature. This produces an effect called “speed drift.” The symptoms are a system which runs Windows when first turned on; however, after 15 minutes or so, the system starts having memory errors. A high quality SIMM tester can cycle the chips through various voltage and heat cycles, so this is fairly easy to see.

To fix this memory Parity Errors Simply follow this Computer Support Services

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One Response

  1. is there no cool little app that you can run to check these errors, one that actualy works.

    There is too many apps out there that dont work.

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