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  1. Uniform memory access (UMA): All processors have access to all parts of main memory using loads and stores. The memory access time of a processor to all regions of memory is the same. The access times experienced by different processors are the same. 
  2. Nonuniform memory access (NUMA): All processors have access to all parts of main memory using loads and stores. The memory access time of a processor differs depending on which region of main memory is accessed. The last statement is true for all processors; however, for different processors, which memory regions are slower and which are faster differ. 
  3. Cachecoherent NUMA (CC-NUMA): A NUMA system in which cache coherence is maintained among the caches of the various processors.

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