CAS latency question

[Fabio]

What does it mean when the CAS Latency is listed as 2.5-4-4 as opposed to just regular 2.5 or even 2-3-3???

 

[mrwxyz]

CAS latency is basically how quickly memory can locate the data stored in it. the data is stored in array, and CAS refers to a ratio of column access time per clock cycle. The lower the CAS latency, the better....but the difference between CAS2 and CAS3 will not be noticed under normal operation.

 

[Fabio]

But why is it llisted as 2.5 or 2.5-4-4? What is the -4-4 all about?

 

[jhurst]

The first number is known as the CAS latency (2.5). The additional numbers after (usually there are 3), are another timing measurement. The lower number, the faster also applies to those additional timing numbers. I.E. CL2-2-2-5 is faster than CL2.5-4-4-8.

 

[mrwxyz]

Originally posted by: Fabio
But why is it llisted as 2.5 or 2.5-4-4? What is the -4-4 all about?

the other numbers arent as important as the first one, the CAS latency, so they r sometime left out

 

[jhurst]

Originally posted by: mrwxyz

Originally posted by: Fabio
But why is it llisted as 2.5 or 2.5-4-4? What is the -4-4 all about?

the other numbers arent as important as the first one, the CAS latency, so they r sometime left out

That is wrong. The other timings are actually MORE important than the CAS number. I'll try to find the review on that one.