Latency is the gap between these two events. When the memory controller tells the memory to access a particular location, the data must go through a number of clock cycles in the Column Address Strobe CAS to get to its desired location and complete the command.
With this in mind, there are two variables that determine a module's latency:. In the history of memory technology, as speeds have increased, which means clock cycle times have decreased , the CAS latency values have also increased, however because of the faster clock cycle the true latency as measured in nanoseconds has remained roughly the same.
By optimizing the balance between the maximum speed your processor is capable of and the lowest latency memory available within your budget, you are able to achieve a higher level of performance using newer, faster, and more efficient memory.
Based on in-depth engineering analysis and extensive testing in the Crucial Performance Lab, the answer to this classic question is BOTH! Speed and latency both play a critical role in system performance, so when looking to upgrade we recommend:. All rights reserved. Neither Crucial nor Micron Technology, Inc.
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Visit our corporate site. All rights reserved. England and Wales company registration number Oct 31, Question RAM frequency and latency. Oct 26, Sep 30, Question Can a ram work with another ram that have different latency and frequency? Sep 28, Sep 27, Sep 18, Question How much is too much CL Latency? Sep 4, And while speed is easy to understand and measure, latency is much more complex — and often misunderstood. Here's how that misunderstanding, now known as the latency paradox , ultimately answers the performance question.
Most people believe that: CAS latency is an accurate indicator of real world latency performance As speeds increase, CAS latencies also increase, effectively nullifying some of the speed gain. Latency is often misunderstood because on product flyers and spec comparisons, it's noted in terms of CAS latency CL , which is only half the formula for calculating latency.
Since CL ratings only represent the number of clock cycles that a module must complete, they don't say anything about the length of each clock cycle, which means they aren't an accurate indicator of latency performance.
True latency is a much better indicator of performance, as it takes the number of clock cycles and the length of each clock cycle into account.
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