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Cas Latency is a rating of how fast the memory module can complete the second section of the read/write cycle. CAS 2 parts can complete the second section of the cycle in 2/10th of the complete cycle, a CAS 3 part needs to have 3/10th of the cycle allocated to this section. Some systems (usually higher speed Athlon or Brand Name systems) cannot run with the slower CAS 3 memory. AMD recommends CAS 2 latency for all Athlon & Duron based systems.