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Old 01-16-2008, 03:58 PM   #1 (permalink)
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Default what is RAM timing

i dont know alot about RAM, so my question is what is RAM timing, and how and it effect what RAM one buys

also what do all the diffrent numbers mean

just one more thing, how does overclocking effect it?

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Old 01-16-2008, 04:25 PM   #2 (permalink)
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Default Re: what is RAM timing

Think of the RAM as a spreadsheet, with rows and columns. And think of the timings, as the time it takes to access those rows and columns.

CAS - Column Address Select
RAS - Row Address Select

Each number represents a different function:

4.....CL - CAS Latency
4.....tRCD - The time between RAS and CAS signals
4.....tRP - The time between switching a row
12...tRAS - The time between activating and deactivating a row.

CL or Cas Latency is probably the most important part for RAM timings. It is time between it's signal and the data available for processing. So the lower the CAS, the faster it can get and receive data.

tRCD is the time between, a row being selected/activated, and the column in the row being activated, by the CAS signal. In other words, the time between RAS to CAS being accessed.

tRP is the time between accessing different rows. A row has to be activated, in order to access the information. And before the RAM can access another row, the row that was just accessed, has to be deactivated. So in order words, the time between accessing one row to another.

tRAS is the time between the memory getting the signal, to access a row.

I tried my best to explain it, so please correct me if I'm wrong.



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Old 01-16-2008, 05:08 PM   #3 (permalink)
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Default Re: what is RAM timing

yeah that a good way to put it b1gapl, when ur buying ram the lower the timmings ex.


the 4-4-4-12 would be faster in the way that b1 explained. Remember though when they have ram up in the thousand mark u have to look at the timmings because it is usually higer then 800mhz and higher means slower
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Old 01-16-2008, 05:13 PM   #4 (permalink)
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Default Re: what is RAM timing

aight well it makes sence so thanks guys
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