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[Official] ASUS sabertooth AMD Owners Club - Page 680

Poll Results: whats your choice for 990fx

Poll expired: Jul 11, 2011  
  • 0% (1)
    Asus M5A97evo
  • 0% (1)
    Asus M5A99Xevo
  • 49% (58)
    Asus Sabertooth 990fx
  • 31% (37)
    Asus Crosshair V Formula / Thunderbolt
  • 0% (1)
    Biostar TA-990FXE
  • 12% (15)
    Gigabyte GA-990FXA-UD7
  • 4% (5)
    MSI 990FXA-GD80
118 Total Votes  
post #6791 of 10135
Quote:
Originally Posted by mus1mus View Post

Click on the Save.

Quite high on latency I think.

How to improve the latency? Is it the nb or the ram timings?
post #6792 of 10135
Quote:
Originally Posted by carloyz250f View Post

How to improve the latency? Is it the nb or the ram timings?

i just ran aida64 memory bench and i got nearly the same result you did and when i overclocked to 4.8 my latency dropped from 62.5 to 56.8 so based on my own experience i think it's tied with the CPU rather than the NB or anything else.

Just to see what happens try overclocking only with the multiplier and put the NB and HTT frequency to 2600MHz
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post #6793 of 10135
Quote:
Originally Posted by philhalo66 View Post

i just ran aida64 memory bench and i got nearly the same result you did and when i overclocked to 4.8 my latency dropped from 62.5 to 56.8 so based on my own experience i think it's tied with the CPU rather than the NB or anything else.

Just to see what happens try overclocking only with the multiplier and put the NB and HTT frequency to 2600MHz
Thank you for the info. Im curently testing some stufs. Hehehe..
post #6794 of 10135
Quote:
Originally Posted by philhalo66 View Post

i just ran aida64 memory bench and i got nearly the same result you did and when i overclocked to 4.8 my latency dropped from 62.5 to 56.8 so based on my own experience i think it's tied with the CPU rather than the NB or anything else.

Just to see what happens try overclocking only with the multiplier and put the NB and HTT frequency to 2600MHz

Something might be wrong on you timings. 10-11-11-13
13 should be around 30 iirc..

Besides you did run cpunb to 2600..
post #6795 of 10135
Quote:
Originally Posted by mus1mus View Post

Something might be wrong on you timings. 10-11-11-13
13 should be around 30 iirc..

Besides you did run cpunb to 2600..

does it matter if its lower than 30? and yes i did run 2600 is that bad?
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post #6796 of 10135
Quote:
Originally Posted by philhalo66 View Post

does it matter if its lower than 30? and yes i did run 2600 is that bad?

Actually might lose some bandwidth.

2600 is just right to give you a good score..

Compared to fsb + multi though, hmmm


Edit:
Here, to show you that memory latency is not linked to CPU clock.

Same timings. Just the CPU multi changed.
Warning: Spoiler! (Click to show)
4.75 GHz



4.5 GHz


Edited by mus1mus - 4/15/14 at 8:54am
post #6797 of 10135
Quote:
does it matter if its lower than 30?

tRAS should be the sum of the other 3 timings. For example, 9-9-9 should have a tRAS of 27.

Of the 4 timings given by the manufacturer, tRAS is the least important for performance, CAS which is the first 9, is the most important.

You dont want to set tRAS too low, it will hurt performance. Setting tRAS too low is like someone turning a page in a book before you finished reading the page. Then you have to go back and re-read the page. Thats time consuming as heck, heh. You want the page turned at just the moment youve finished reading it for max efficiency. And its better to have the page turned a bit slower than it is to go back and re-read the page.
Edited by cpmee - 4/15/14 at 9:09am
    
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post #6798 of 10135
Quote:
Originally Posted by carloyz250f View Post

Quote:
Originally Posted by mus1mus View Post

Click on the Save.

Quite high on latency I think.

How to improve the latency? Is it the nb or the ram timings?

Bulldozer's L3 cache is to blame and there's not much you can do unfortunately.

AMD initially said they would address the issue with Steamroller then later decided it wasn't really a priority... Dunno what the end result was....
Edited by Pill Monster - 4/15/14 at 10:06pm
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post #6799 of 10135
Quote:
Originally Posted by cpmee View Post

Quote:
does it matter if its lower than 30?

tRAS should be the sum of the other 3 timings. For example, 9-9-9 should have a tRAS of 27.

Of the 4 timings given by the manufacturer, tRAS is the least important for performance, CAS which is the first 9, is the most important.

You dont want to set tRAS too low, it will hurt performance. Setting tRAS too low is like someone turning a page in a book before you finished reading the page. Then you have to go back and re-read the page. Thats time consuming as heck, heh. You want the page turned at just the moment youve finished reading it for max efficiency. And its better to have the page turned a bit slower than it is to go back and re-read the page.
most say add the three and subtract 3
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post #6800 of 10135
Quote:
most say add the three and subtract 3
Yeah, it does seem like a lot of manufacturers do that nowadays. But plus 3 tRAS means nothing for performance.
    
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