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what are memory timeings

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Old 03-02-08, 10:15 AM Thread Starter   #1
antipesto93
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what are memory timeings


when looking for more ram..i see theings like 5-5-5-12
what do they mean?

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Old 03-02-08, 10:37 AM   #2
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Delay before the memory can be accessed. The lower, the better.

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Old 03-02-08, 12:00 PM   #3
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see here: latency=timings for the most part

http://en.wikipedia.org/wiki/RAM_latency

and here:

http://www.ocforums.com/showthread.php?t=257741

Quote:
"Memory timings

Memory performance is not entirely determined by bandwidth, but also the speeds at which it responds to a command or the times it must wait before it can start or finish the processes of reading or writing data. These are memory latencies or reaction times (timings). Memory timings control the way your memory is accessed and can be either a contributing factor to better or worse 'real-world' performance of your system.

Internally DRAM has a huge array of cells that contain data. (If you've ever used Microsoft's Excel, try and picture it that way) A pair of row and column addresses can uniquely address each cell in the DRAM. DRAM communicates with a memory controller through two main groups of signals: Control-Address signals and Data signals. These signals are sent to the RAM in order for it to read/write data, address and control. The address is of course where the data is located on the memory banks, and the control signals are various commands needed to read or write. There are delays before a control signal can be executed or finish and this is where we get memory timings. The standard format for memory timings are most often expressed as a string of four numbers, separated by dashes, from left to right or vice-versa like this 2-2-2-5 [CAS-tRP-tRCD-tRAS] . These values represent how many clock cycles long each delay is but are not expressed in the order in which they occur. Different bioses will display them differently and there maybe additional options (timings) available."
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