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Lower RAM clock to tighten timings?

post #1 of 9
Thread Starter 
I have this very good Kingston RAM. Many people say that they are able to lower the 1066 Mhz clock down and decrease the timings from the default 5-5-5-18 to 4-4-4-15. Is this a good tradeoff?
Edited by MaxRabbit - 4/21/11 at 5:41am
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post #2 of 9
Latency isn't the same as timings. To put it differently:
*you want latency as low as possible
*you want bandwidth as high as possible
*latency decreases and bandwidth increases with the increase of clock speed
*latency decreases and bandwidth increases with tighter timings

...as such many users find that DDR 1066 @ 5-5-5-18 is just as fast as DDR 800 @ 4-4-4-15 because you loose by lowering clock speed but you gain by tightening timings. If performance between these two modes is equal (which isn't always the case) I prefer the lower clock/tighter timings as they usually need lower voltage and consume less power (thus less heat in my case).

Welcome to OCN
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by dragosmp;13214036 
Latency isn't the same as timings. To put it differently:
*you want latency as low as possible
*you want bandwidth as high as possible
*latency decreases and bandwidth increases with the increase of clock speed
*latency decreases and bandwidth increases with tighter timings

...as such many users find that DDR 1066 @ 5-5-5-18 is just as fast as DDR 800 @ 4-4-4-15 because you loose by lowering clock speed but you gain by tightening timings. If performance between these two modes is equal (which isn't always the case) I prefer the lower clock/tighter timings as they usually need lower voltage and consume less power (thus less heat in my case).

Welcome to OCN
I understand what you mean about latency; I updated my post to be correct.

So based on what you're saying: if I could get 4-4-4-15 timings at ~960 Mhz (what I am running now, since my CPU overclock throws off the timings), that would be better than 5-5-5-18 at 1066 Mhz for gaming and such?

And thanks for the welcome smile.gif I was a TomsHardware junkie but that place is dead.
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post #4 of 9
Welcome from me too!
There is a little program called maxxmem! (sorry didn`t find a nice download link)
With this program you can test your RAM for bandwith and latency.
All my test on my system showed that my system likes higher clocks more than tighter timings.
So benchmark your RAM @different setting and see whats best for you.
Good Luck!
And please be so kind and fill out your system specs. (found under "User CP" on the top of the page)
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by Mr.Eiht;13220788 
Welcome from me too!
There is a little program called maxxmem! (sorry didn`t find a nice download link)
With this program you can test your RAM for bandwith and latency.
All my test on my system showed that my system likes higher clocks more than tighter timings.
So benchmark your RAM @different setting and see whats best for you.
Good Luck!
And please be so kind and fill out your system specs. (found under "User CP" on the top of the page)
And thank you smile.gif
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post #6 of 9
Quote:
Originally Posted by MaxRabbit;13214067 
I understand what you mean about latency; I updated my post to be correct.

So based on what you're saying: if I could get 4-4-4-15 timings at ~960 Mhz (what I am running now, since my CPU overclock throws off the timings), that would be better than 5-5-5-18 at 1066 Mhz for gaming and such?

And thanks for the welcome smile.gif I was a TomsHardware junkie but that place is dead.

Off the top of my head 4-4-4-15 @960 is faster than 5-5-5-15@1066. Usually one step on the timings get balanced by a step on the clock speed, since 960 is pretty close to 1066 (vs 800&1066) then the one-step-tighter timings should make latency lower and bandwidth at least at the same level.

...true, Tom's has changed from an enthusiast site to something more of a mainstream PC magazine. Still useful from time to time, but not as it was not so long ago.
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post #7 of 9
I wouldn't call that kit "very good", considering the most common voltage required for 1066 CAS 5 is usually 2.1v and OCZ has made kits that run it at 1.8v.

Anyway, back when I was on AM2+ I found that 1066mhz CAS 5 was always faster than 800mhz CAS 4.
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post #8 of 9
To be fair, I had 4x2GB of those Kingston Hyper X sticks. They can likely pull off considerably higher. I got 1250 @ 6-6-6-18. And even with an AMD setup, that was faster than even 1100 @ 5-5-5-15 (also stable).

Basically, get your RAM speed as high as you can. Especially since you have an Intel setup. Then tighten your timings down one at a time. Intel will definitely prefer the higher clock speed over the tighter timings.
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by pioneerisloud;13226229 
To be fair, I had 4x2GB of those Kingston Hyper X sticks. They can likely pull off considerably higher. I got 1250 @ 6-6-6-18. And even with an AMD setup, that was faster than even 1100 @ 5-5-5-15 (also stable).

Basically, get your RAM speed as high as you can. Especially since you have an Intel setup. Then tighten your timings down one at a time. Intel will definitely prefer the higher clock speed over the tighter timings.
Thanks, I didn't even think of that option smile.gif
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