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680i SLI FSB Straps - Page 3

post #21 of 41
surley an actual performance graph will give you the exact same idea but the steeper the gradient the more stable/more performance per Mhz. + wont confuse people by making it 'seem' higher clocks are slower.

heres what actual performance would look like based on the other results, the relitive performance graph is the differential of the actual performance line. but if you fully understand the relitive performance graph it does distinguish the good and bad spots more effectivly.

but anyway interesting stuff! thx +rep
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Kelvin
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post #22 of 41
I see thank you.
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post #23 of 41
Quite correct Chozart Think of straps as a set of northbridge latencies, like on RAM. Once a certain speed is requested of the (MCH in this case), it automatically drops these latencies inside in order to maintain stability. On certain boards (My abit QuadGT comes to mind) you can manually set these straps, to be able to a)maintain control over your motherboard and know which strap it's running at, and b)to squeeze some extra performance outside of the automatic strap changes. On the 680i however, I have not seen a board capable of manually setting straps, only on the 965's.

As to the sudden performance dips around the 1300-1500 QDR (FSB*4 ) range, I can't explain it. Someone who is a computer engineer or electrical engineer might be able to explain it, but all I can say is drop your CPU multiplier and go to 1550+ QDR

And remember, straps are latency settings, on the northbridge. Nowhere else
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post #24 of 41
Quote:
Originally Posted by Modki View Post
Why does performance go down as clockspeed goes up. Am I not reading these right
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post #25 of 41
Thread Starter 
Quote:
Originally Posted by Licht View Post
Go read page 2 and 3 of this topic....
Once again...
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Once again...
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post #26 of 41
ah straps are automatic chipset latencies , clear as day
as u say erratic bit up to 1450 is weird tho
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post #27 of 41
Nice information for the 680i.Example i been oc with my x 10 multy.Mean if i lowered and go up with the, fsb maybe notice some increase in performance and benches?
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post #28 of 41
Exactly, sometimes though if you lower the multi and boost the FSB, but remember this, it depends on the board not the CPU. Chozart does a good job at explaining this as well as others who have said that the NB acts like something taht automatically changes the latencies.
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post #29 of 41
I know, old news. However, does this apply to all 680i boards? Is it a bios issue that may have been fixed with the more recent bios updates?
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post #30 of 41
Lol, this confirms my suspicians. I had wierd problems with testing/benchmarking when I had my P5N32-E SLI at those frequencies.
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