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Memory Bandwith

post #1 of 11
Thread Starter 
Hey. I've got a question.

If i test my Mem with SISANDRA memorybandwith test, I get in AUTO mode (no Overclocking) 3000 points or so. If I overclock my system and get the best setting for my mem I have 2700-2800.

How come? And what should I do?
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post #2 of 11
Quote:
Originally Posted by AMD-rules
Hey. I've got a question.

If i test my Mem with SISANDRA memorybandwith test, I get in AUTO mode (no Overclocking) 3000 points or so. If I overclock my system and get the best setting for my mem I have 2700-2800.

How come? And what should I do?
Are you loosening the timings to do the overclock?
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Clevo P170HM
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by Ste
Are you loosening the timings to do the overclock?
yes, i think so. Normally the Bios automaticly controls it and then i think the memory clock is 400mhz. When I overclock the Timings are: 333mhz, 2.0-2-2-5
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post #4 of 11
Quote:
Originally Posted by AMD-rules
yes, i think so. Normally the Bios automaticly controls it and then i think the memory clock is 400mhz. When I overclock the Timings are: 333mhz, 2.0-2-2-5
You've slowed the memory down so that's why there's less bandwidth. If you've got a higher CPU speed then stick with it as CPU speed is the most important aspect.
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post #5 of 11
Do you have 3 mem modules to get that 768megs?
The MB may default to 333 with 3 of them.
    
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by The Duke
Do you have 3 mem modules to get that 768megs?
The MB may default to 333 with 3 of them.
No. 2: 1 Kingston 512 and 1 256mb PQI

With 333mhz; 2.0-2-2-5 i get 2200 Bandwith.
Isn't it the lower the CAS timings the better?
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post #7 of 11
you have the get a higher Mhz with some good timmings too!
even tho youhave lower timmings you have a lower speed,find the best of the two
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by JackTheRipper
you have the get a higher Mhz with some good timmings too!
even tho youhave lower timmings you have a lower speed,find the best of the two
Don't understand..?

Never mind everyone.

I have now 333mhz; 2.5-3-3-6
2800 Bandwith. So i'me happy
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post #9 of 11
yeah, there are 2 things to look at when judging memory bandwith or performance.
frequency
timings

yes, if you have the same ram running 2.5-2-2-5 @ DDR400 and compare it to 2-2-2-5 @ DDR400 then the tighter timings would be better... but if to get the tighter timings you drop to DDR333 you've lost bandwith because you've drasticly cut your frequency.

typically when overclocking it is better to run slightly looser timings at a higher frequency than tighter timings at a lower frequency.

for example. I get better performance with my RAM running DDR520 @ 2.5-3-3-7 than I do running DDR400 @ 2-2-2-5. It's because even though my timings aren't as good... the increase in frequency more than makes up for it.
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by soloz2
yeah, there are 2 things to look at when judging memory bandwith or performance.
frequency
timings

yes, if you have the same ram running 2.5-2-2-5 @ DDR400 and compare it to 2-2-2-5 @ DDR400 then the tighter timings would be better... but if to get the tighter timings you drop to DDR333 you've lost bandwith because you've drasticly cut your frequency.

typically when overclocking it is better to run slightly looser timings at a higher frequency than tighter timings at a lower frequency.

for example. I get better performance with my RAM running DDR520 @ 2.5-3-3-7 than I do running DDR400 @ 2-2-2-5. It's because even though my timings aren't as good... the increase in frequency more than makes up for it.
So, DDR 400 3.0-5-5-x would be better then DDR 333 2.0-2-2-x ?
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