[Rebel]

Why is there CAS latency? why there i a time that must pass till data comes out after sending the column address? I heard its the amount of time required to access a column of data?But what actually happens during "accessing" a column of data?And how come we can control the CAS latency from the bios?what actually happens when u lower the CAS from 3 to 2?is there a certain signal from the memory controller that lasts for the period of CAS latency thus when u change the latency from 3 to 2? this signal or whatever it is lasts for 2 cycles not 3?I am trying to make conclusions please answer in "DEPTH" and in "DETAILS" i know its confusing to read but please try to understand what i mean Thanks in advance

[Razer]

From what I hear:

The latency is divided up into 4 sections. X-Y-Z-AA

The last number is almost always a double. The lower numbers are the better. The latency is the time it takes to move through the RAMs columns and rows. Lower latency = faster.

CAS latency is the time it takes for the memory controller to tell the RAM what it wants and the RAM to make this information available on the RAMs output pins.

[Rebel]

thanks for answering but my question has more info than your answer