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Memory Latency Formula:
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Memory latency refers to the time delay between when a memory controller requests data from memory and when that data is available. It's a critical performance metric in computer systems, measured in nanoseconds (ns).
The calculator uses the memory latency formula:
Where:
Explanation: The formula converts CAS latency cycles to time by accounting for the memory's data transfer rate. The constant 2000 converts megatransfers per second to nanoseconds.
Details: Accurate memory latency calculation is crucial for system performance optimization, memory timing configuration, and understanding the real-world performance impact of different memory specifications.
Tips: Enter CAS Latency in cycles and Data Rate in MT/s (megatransfers per second). Both values must be positive numbers for accurate calculation.
Q1: What is CAS Latency (CL)?
A: CAS Latency is the number of clock cycles between when a memory controller requests data and when the data is available from the memory module.
Q2: How does data rate affect latency?
A: Higher data rates generally result in lower latency because each clock cycle is shorter, but the actual latency depends on the CAS Latency value.
Q3: What are typical memory latency values?
A: Typical DDR4 memory latencies range from 10-20 ns, while DDR5 can achieve lower latencies around 8-15 ns depending on the specific memory configuration.
Q4: Why is the constant 2000 used in the formula?
A: The constant 2000 converts megatransfers per second to nanoseconds (1000 for seconds to milliseconds, and another 1000 for milliseconds to nanoseconds, but simplified for the conversion).
Q5: Can this formula be used for all memory types?
A: This formula works for DDR (Double Data Rate) memory types including DDR3, DDR4, and DDR5, as they all use similar timing principles.