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Understanding RAM timings.. again!

post #1 of 12
Thread Starter 
okay ive got down what 8-8-8-24-40-1t do.

8-8-8 are time to check, get, and send (in words)
the 24 should be those 8's x3 =24.

or am i wrong on that?
like 6-6-6 would be 6-6-6-18
and so on. right?

whats the "40" for .. and 1t is as best as it gets so ive heard

thanks again for the help.
remeber! i DO dish out "unique rep" for those that really try
to answer.. you aint gotta be right. but at least try! lol

thnks


EDIT!
okay now i see just the first number the cas latency is to get, find, and put out..
so what are the others good for??
Edited by trusodapop - 3/30/11 at 10:26pm
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post #2 of 12
Thread Starter 
wait. im starting to understand this..

the formula T = x / ram timing (the real time (1600 is actually 800) )

so i plug in 2 factors to see whats faster..

8 / 800 (ddr3 1600) x1000 (for nano seconds) = 10 nano seconds ( 5ns for DDR )

and

6 / 666.5 (ddr3 1333) x 1000 = 9 ns (4.5 DDR)

so i could esentially get better performance changing my 1600 to 1333 and lower cas..

right? because to my understanding the lower the frequency the easier it is to lower the cas..

correct me if im wrong..
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post #3 of 12
The "40" is the tRC, ideally it should be the last of the "8" values (tRP) + the tRAS (24 value)

That formula only applies for latencies, not actual bandwidth/speed; it starts to degrade below 1600Mhz on AMD.
post #4 of 12
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
The "40" is the tRC, ideally it should be the last of the "8" values (tRP) + the tRAS (24 value)

That formula only applies for latencies, not actual bandwidth/speed; it starts to degrade below 1600Mhz on AMD.


let me make sure i understand you right..

say it was 7-7-7-21 the last should be 28 ? so 7-7-7-21-28?

im just wondering if i should set it to
1333 @ 6-6-6-18-24

or 1600 @ 8-8-8-24-32

? right? which in math, the 1333 would be faster by 1.1 ns
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post #5 of 12
You are right there with regards to theory, but in practice it can be different. Seeing that you overclock and are not scared to do so, try this, at 1600 8-8-8-24 do a superpi 1m run and see what time you get, then go to your BIOS, and change your setting around a bit, set your fsb to about 220, your RAM to 1333(at 220 it will ab around 1450 odd) and try lower your timings to say 7-7-7-21 or even 6-6-6-18. Do 1 item at a time and make sure that you can boot in between each one. Once you have found your best RAM speed at those settings, then take your CPU/NB and clock that a bit, try aim for about the 2.8 - 3Ghz mark. Once you have that all set, then go into windows and re-run superpi 1m and see what time you get. Make sure to write down all changes made so that if your first run is better then you can restore that otherwise keep the new settings. It may take a while and require alot of patience but will be worth it in the end.
   
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post #6 of 12
Thread Starter 
okay now im running into a big problem.

i can adjust dct 0 just fine.
but since im running dual channel.

i try to adjust dct 1 and i wont boot.
my mb has a lovely feature that clear cmos for me..

but whats the jig?

im putting the exact same timings and config on dct1 as dct0..

system tech, i will def try your technique out. thanks bro
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post #7 of 12
I've always wondered about timings... I never put the effort into messing with them. Are there noticeable effects past SuperPi-like benchmarks?

Sub'd.
post #8 of 12
Set RAM timing setting to "both" then configure both DCT0 and DCT1 to the same thing?
post #9 of 12
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
Set RAM timing setting to "both" then configure both DCT0 and DCT1 to the same thing?

yes. i was told in dual channel you should set both to exact specifications.
and when i just set dct0 it boots fine and in cupid it shows the
timings for all rams in one i suppose.

but if i even try to mess with dct1 and do the exact same settings.
it resets all my config and i have to start all over..

my guess is it must be automated and if dct0 is set.
and dct1, all is set to auto, it mimics on its own.. ?
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post #10 of 12
Thread Starter 
Quote:
Originally Posted by EfemaN View Post
I've always wondered about timings... I never put the effort into messing with them. Are there noticeable effects past SuperPi-like benchmarks?

Sub'd.

yes, def noticable speeds, load times, etc.

BUT they are BY FAR the hardest things to get a stable oc on.
the cas timings are just so difficult to work with.
its almost not worth the hassle.
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