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Timing vs frequency question

post #1 of 11
Thread Starter 
Looking at some 4GB dual channel ddr3 kits for my parent's HTPC custom build.

Issue I have is I don't know all that much about ram timings and frequencies etc.
From my Google search I gather that you want the "timing" to be lower* and that the numbers DDR3-xxxx is the maximum frequency that the ram can operate.** The PC-yyyy indicates transfer speed in MB/s.

Okay, Actual question time.
Gskill has a few 4GB kits in the range of $26-$32, I figured I ought to get the best out of them, even if it won't make much difference.
Common specs include
DDR3-1333 7-7-7-21
DDR3-1333 8-8-8-24
DDR3-1333 7-7-7-21
DDR3-1333 9-9-9-24
DDR3-1600 9-9-9-24

Which of these would overall be "the best'
From my limited knowledge it would either be the DDR3-1333 @ 7-7-7-21 or the DDR3-1600 @ 9-9-9-24 but I don’t really know.

Does anyone know?
Telling me that I'm completely wrong and providing ether a link for reading or explanation as to why I am wrong is also an expectable answer. thumb.gif


* I.E. 7-7-7-21 is better than 9-9-9-24
** not the actual operating frequency which is usually, by default, half of the maximum.
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post #2 of 11
If you have an AMD chip, given its memory bandwidth is the limiting factor. Therefore, lower timings would yield better results more so then a higher frequency. Intel rigs, on the other hand, given their MUCH higher memory bandwidth (outside of bulldozer), higher frequencies tend to yield better results then tighter timings on its platform.

PII -> tighter timings
Intel (any core iX) -> high frequency
Bulldozer -> higher frequency
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by Domino View Post

If you have an AMD chip, given its memory bandwidth is the limiting factor. Therefore, lower timings would yield better results more so then a higher frequency. Intel rigs, on the other hand, given their MUCH higher memory bandwidth (outside of bulldozer), higher frequencies tend to yield better results then tighter timings on its platform.
PII -> tighter timings
Intel (any core iX) -> high frequency
Bulldozer -> higher frequency

it will probable be a APU is that apart of the bulldozer? or is it separate?
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post #4 of 11
Is it Llano? You're best of with 1600 9-9-9-24.
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post #5 of 11
AMD APUs like high frequencies but the rest of the AMD CPUs generally prefer low timings.
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post #6 of 11

Although very minimally, DDR3-1600 9-9-9-24 has been shown to have an edge over DDR3-1333 7-7-7-21.

 

AMD CPUs do not necesasrily prefer low timings. The point to make with low timings on AMD CPU platforms (at least on AM3/Phenom II) is that low timings do make a difference, whereas on other platforms (i.e. Intel) it does not seem to be that way.  Getting the same performance with lower timings as you would expect with higher speeds was possible, and was relevant during the days before the release E0 revision CPUs when it was hard to get RAM speeds beyond DDR3-1866, hence the chit-chat that "AMD prefers lower timings."  There isn't really a preference to select from I guess.

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post #7 of 11
7 clock pulses at 1300Mhz = 5.385 miliseconds nanoseconds?
9 clock pulses at 1600Mhz = 5.625 nanoseconds

A Timing of 8 at 1600Mhz would actually be quicker than a 7 at 1333Mhz:
8 clock pulses at 1600Mhz = 5 nanoseconds

Many people don't realize how the frequency is affecting the timing.9 at 1600 is the closest match to 7 at 1333.

Edit: I think the units are right now... That was a brain fart!
Edited by merlinx76 - 7/9/12 at 10:10am
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by merlinx76 View Post

7 clock pulses at 1300Mhz = 5.385 miliseconds nanoseconds?
9 clock pulses at 1600Mhz = 5.625 nanoseconds
A Timing of 8 at 1600Mhz would actually be quicker than a 7 at 1333Mhz:
8 clock pulses at 1600Mhz = 5 nanoseconds
Many people don't realize how the frequency is affecting the timing.9 at 1600 is the closest match to 7 at 1333.
Edit: I think the units are right now... That was a brain fart!

thinking.gif
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post #9 of 11
Since you're building an HTPC rig for your parents, I'd think speed would be a moot point. I think I'd be looking for lower volt memory like these G.Skill ECO ram:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231316

My parents just use their htpc to play online videos and recording TV so it's on 24/7. I'm sure they'd rather have a lower power bill than anything. The one I built uses 40 Watts max.

Luck
-=Mark=-
post #10 of 11
Thread Starter 
Quote:
Originally Posted by MarkJohnson View Post

Since you're building an HTPC rig for your parents, I'd think speed would be a moot point. I think I'd be looking for lower volt memory like these G.Skill ECO ram:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231316
My parents just use their htpc to play online videos and recording TV so it's on 24/7. I'm sure they'd rather have a lower power bill than anything. The one I built uses 40 Watts max.
Luck
-=Mark=-

true true ty
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