newbie question about memory

[vood0g]

i am looking at the different types of memory and was just wondering what the 4 numbers mean. the numbers i am talking about are the ones associated with latency (x-x-x-x). lurking in the forums i can tell that 2-2-2-x is desirable. what is the 4th number? thx.

 

[htmlmasterdave]

It has to do with write and read latencies. Lower numbers speed up transfers and access times, while higher numbers reduce performance. Basically buy the lowest you can afford

 

[DrMoe]

The fourth number is generally the tRAS value. Many times a fifth number, the command rate, is also listed. All values are in clock cycles. Look HERE for more information than a newbie ever probably wanted to know about memory.

Moe

 

[vood0g]

thx moe,

although that slide show did provide me with some answers, it also left me with more questions. i'll hang around the forums a bit to see if i can get the answers.

 

[Mem]

vood0g:Some good info
here .