Thread: Matching RAM?
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It means that memory should be installed in pairs and that they should be the same size, speed, latency, etc... The most common reason for thus requirement is Dual Channel memory architectures or an old system that uses SIMMS. Other than Dual Channel DIMM Banks though I can't think of why a modern system would require it.

Depending on the system if you put in two non-matching peices of RAM into a single bank it would either not boot, not recognize that bank, or run in Single Channel mode. The first two pretty much mean the system will not run, the last means you are cutting memory performance almost in half.
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