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View Full Version : What does memory latency do?


psyko12
05-18-2008, 09:42 AM
Sorry I'm a n00b at this timings and stuff, just wanted to learn...

http://img.techpowerup.org/080518/mem lat.jpg

Is this latency good or bad? Everest read it...:respect:

Ty advance

Duxx
05-18-2008, 09:52 AM
Wikipedia is your friend :)

Its basically the time between you making a command(asking for information) until the time you receive this information. Lower is better :)

psyko12
05-18-2008, 09:57 AM
I see so mine isn't that bad? Btw does the timings (ras, cas, and stuff) affect it?

Duxx
05-18-2008, 10:05 AM
* CL: CAS Latency. The time it takes between a command having been sent to the memory and when it begins to reply to it. It is the time it takes between the processor asking for some data from the memory and it returning it.
* tRCD: RAS to CAS Delay. The time it takes between the activation of the line (RAS) and the column (CAS) where the data are stored in the matrix.
* tRP: RAS Precharge. The time it takes between disabling the access to a line of data and the begin of the access the another line of data.
* tRAS: Active to Precharge Delay. How long the memory has to wait until the next access to the memory can be initiated.
* CMD: Command Rate. The time it takes between the memory chip having been activated and when the first command may be sent to the memory. Sometimes this value is not informed. It usually is T1 (1 clock cycle) or T2 (2 clock cycles).

Stole from hardware secrets(first to come up in google) so, yes these along with many others(less mentioned, don't worry about) and your speed affect your RAM.

psyko12
05-18-2008, 11:05 AM
Thanks, and sorry for not using the webs "Best friend" hehe, just didn't know where to look... :D :respect:

Kursah
05-18-2008, 11:16 AM
Thanks, and sorry for not using the webs "Best friend" hehe, just didn't know where to look... :D :respect:

It's now where you look, but how you look for it...a lot can be found by typing what you want to search for correctly...this can be trial and error with different names/slang names/etc. Google is still the best search engine imo for digging up info on OC-ing of components.

:toast:

psyko12
05-18-2008, 11:17 AM
It's now where you look, but how you look for it...a lot can be found by typing what you want to search for correctly...this can be trial and error with different names/slang names/etc. Google is still the best search engine imo for digging up info on OC-ing of components.

:toast:

:respect::respect: you guys saved me in 2 posts today your my heroes along with other ppl here :D btw thanks gonna read more on what google suggests..

Duxx
05-18-2008, 11:20 AM
:respect::respect: you guys saved me in 2 posts today your my heroes along with other ppl here :D btw thanks gonna read more on what google suggests..

hah anytime man :) wikipedia/google = win

Davidelmo
05-18-2008, 07:54 PM
In terms of actual performance though, the latency etc really don't make a huge difference.

If you're a gamer, you're not going to see much better frames per second with 4-4-4-12 than you would with 5-5-5-15 to be honest.

infrared
05-18-2008, 07:59 PM
In terms of actual performance though, the latency etc really don't make a huge difference.

If you're a gamer, you're not going to see much better frames per second with 4-4-4-12 than you would with 5-5-5-15 to be honest.

He's on DDR, not DDR2. :nutkick:

psyko12
05-19-2008, 12:05 AM
Hehe yeah DDR 1 :( heh thnks fellas, just curious bout this stuff XD and boy internet's "Best friends" sure do help alot!!! :respect:

spearman914
05-19-2008, 12:07 AM
Lower or Tighter refers as faster. Higher or Looser refers as slower.