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Difference between memory timings?

post #1 of 6
Thread Starter 
Hello, all! This is my first post here, although I've been a long time reader . So I'll get to it, are the timings "7-8-7-18 1N" ultimately the same as "6-8-6-20 1N?" If they are or are not, why? Thanks ahead for your time and consideration.
    
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post #2 of 6
Quote:
Originally Posted by Joshua89 View Post
Hello, all! This is my first post here, although I've been a long time reader . So I'll get to it, are the timings "7-8-7-18 1N" ultimately the same as "6-8-6-20 1N?" If they are or are not, why? Thanks ahead for your time and consideration.
no, cl7 will have a looser timing @ 2133, typically 2133@cl8 or 9 compared with cl7.
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post #3 of 6
Quote:
Originally Posted by Joshua89 View Post
... are the timings "7-8-7-18 1N" ultimately the same as "6-8-6-20 1N?"
Welcome to OCN!
I don`t get the question.
They are not the same cause the numbers are different
An example:
7 Cas Latency
8 RAS to CAS
7 RAS precharge
24 Row Activate to Precharge
_____________________
7-8-7-24
Two things are the same for both timings the RAS to CAS (8) and the command rate (1N).
Here you find more info`s about RAM.
http://www.overclock.net/intel-memor...explained.html
Did you just wanted to know which are "better/faster"?
Then the answer would be to test it with you specific setup.
Thiss can be done with software like maxxmem.
Anyway have fun here @OCN!
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post #4 of 6
Thread Starter 
As I understand, the processing of information ultimately takes the same amount of time between "7-8-7-18" and "6-8-6-20." My system is stable at both, but no "tighter". "Tighter" in the sense that both sets of numbers add to 40. To put it in an anology, if two people are 6ft tall and are trading length of torso for length of legs, is there really any benefit one has over the other in the end if both people are 6ft tall in the end anyway?
    
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post #5 of 6
Quote:
Originally Posted by Joshua89 View Post
As I understand, the processing of information ultimately takes the same amount of time between "7-8-7-18" and "6-8-6-20." My system is stable at both, but no "tighter". "Tighter" in the sense that both sets of numbers add to 40. To put it in an anology, if two people are 6ft tall and are trading length of torso for length of legs, is there really any benefit one has over the other in the end if both people are 6ft tall in the end anyway?
yes and no tbh, they are all closely linked to oneanother, and although the summation of 7-8-7-18 and 6-8-6-20 are the same, it does not correspond to identical memory performance in all areas.

For example, your IMC wants to access X3 (row X column 3), so it waits for the row delay (tRAS) before it looks for X, then waits for the tRCD (RAS to CAS delay) then, if CAS is the same value as tRCD, which it usually isn't (about 2 higher) it looks for column 3 and executes a read.

The thing is, changing tRAS (which should be CAS+tRCD+2ish..higher for higher frequencies) makes very little difference in performance when compared to chaning CAS or command rates.
Edited by fluxlite - 5/1/11 at 2:34am
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post #6 of 6
Thread Starter 
Thank you all for your help and thorough explanations; my questions have been resolved.
    
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