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680i SLI FSB Straps - Page 2

post #11 of 41
So my 3.5Ghz E6300 would perform worse than a stock one because of these "loosened CPU timing" things?
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post #12 of 41
Thread Starter 
Quote:
Originally Posted by {core2duo}werd View Post
yeah i don't get what all this means.
Straps are certain areas that the chipset does not perform as stable/well. Lets say you are increasing your FSB and you hit instablity at like 1200MHz. Normally, you would think this is the limit of your overclock. However, you may want to try dropping your CPU multiplier and increase your FSB so you pass the clockspeed where you hit instability. It maybe that your chipset is unstable but your CPU can go faster. There are certain bands of FSB that the chipsets do not like. On the 680i, it seems to be 1350-1450MHz.
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post #13 of 41
I know what the straps are but I'm concerned about the overall performance just gradually going to pot as you hit higher FSB. WTH?

I think this is a case of someone failing at graphs. Do they mean they expected a higher performance than what they got and that's why it looks lower?
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post #14 of 41
Quote:
Originally Posted by DuckieHo View Post
Straps are certain areas that the chipset does not perform as stable/well. Lets say you are increasing your FSB and you hit instablity at like 1200MHz. Normally, you would think this is the limit of your overclock. However, you may want to try dropping your CPU multiplier and increase your FSB so you pass the clockspeed where you hit instability. It maybe that your chipset is unstable but your CPU can go faster. There are certain bands of FSB that the chipsets do not like. On the 680i, it seems to be 1350-1450MHz.
REALLY? that's exactly where i'm stuck! so i should drop my multi and try a high fsb?
post #15 of 41
No, since it's RELATIVE performance, and of the board, not the CPU. Relative meaning that the effect of the higher FSB is eliminated.

at stock, relative performance is 6.08

at 3.5 GHz the FSB is 1556MHz, and the relative performance is 5.90

Thus, in relative terms, at 1556MHz you have 5.90/6.08 = 97% of the RELATIVE performance at 1066MHz (stock).

In absolute terms, however, performance is of course a lot better at the higher FSP. The performance increase of the higher FSB is 1556/1066 = 46% (without strap). with strap, it is 46 * .97 = 44.6%. Thus, a little loss in performance, but easily made up with increased FSB.
    
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post #16 of 41
Thread Starter 
Quote:
Originally Posted by Modki View Post
I know what the straps are but I'm concerned about the overall performance just gradually going to pot as you hit higher FSB. WTH?

I think this is a case of someone failing at graphs. Do they mean they expected a higher performance than what they got and that's why it looks lower?
http://it-review.net/index.php?optio...1&limitstart=5
Quote:
To actually be able to read something out of those numbers we introduced a measure called “relative performance” that can be easily calculated by dividing the Everest 4 Memory read score by the QDR FSB speed. Memory performance grow should be linear with FSB grow, and the “relative performance” should be a constant. Well, “relative performance” should be a constant if no settings but the FSB speed change, but since we do expect the chipset straps to change this is what a “relative performance” graph should look like:
Quote:
Originally Posted by {core2duo}werd View Post
REALLY? that's exactly where i'm stuck! so i should drop my multi and try a high fsb?
Give it a shot.
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post #17 of 41
Quote:
Originally Posted by Modki View Post
I see the dips that are the straps but overall it looks like performance goes down the higher up your Bus Speed goes?
Quote:
Originally Posted by Modki View Post
Why does performance go down as clockspeed goes up. Am I not reading these right
Quote:
To actually be able to read something out of those numbers we introduced a measure called “relative performance” that can be easily calculated by dividing the Everest 4 Memory read score by the QDR FSB speed. Memory performance grow should be linear with FSB grow, and the “relative performance” should be a constant. Well, “relative performance” should be a constant if no settings but the FSB speed change....
Timings/latencies increase as straps change from 800-1066-1333-1600(is there a 1600?)

If the straps could be held constant fsb growth should be linear with memory performance growth, thus a constant, 1:1 ratio in terms of relative performance...

FSB:1176 MEMread:7146 mem/fsb= 6.08
FSB:1260 MEMread:7635 mem/fsb= 6.06

6.08:6.06 ~ 1:1

Working backwards....

FSB: 1176 MEMread:7146
FSB: 1956 MEMread:11892 Theorhetical
FSB: 1956 Memread:11157 Actual

6.08:5.70 --> ~93.75% --> 6.25% of the theoretical peformance lost due to looser timings brought on by the strap changes...

Although I could be completely wrong

*EDIT*: OOPS Chozart beat me to it sorry for the reiterating what you posted
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post #18 of 41
Why are they making up stuff when they can just show overall performance?
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Mira
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post #19 of 41
Thread Starter 
Quote:
Originally Posted by Modki View Post
Why are they making up stuff when they can just show overall performance?
It reveals more information looking at relative performance than graph of memory scores.
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post #20 of 41
exactly. If you look at absolute, you see small little notches, but that's it. Now you clearly see an impact.
    
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