SLI Performance Increases The % of performance increase aquired threw SLI.
Okay this is going to sound pretty strange to alot of you but here it goes.

I have heard that on average you will recieve a 70% increase in performance when using SLI. While the everyday person may think that isn't much, if you consider the performance differece between a $300 and a $500 card is typically about 15-20% It makes since to SLI.

So now here's the big question.

If a 2-way will produce a 70% increase in performance over the original, what % will you get from a 3-way sli?

In math terms...

If performance from card X=1 then...
the performance from Card X 2-way SLIed = 1.7

Will 3-way = 2.4? or is in deminishing rate of return wher it will = 70% of 70% = a 49% increase for the last one? Or less?
Okay this is going to sound pretty strange to alot of you but here it goes.



I have heard that on average you will recieve a 70% increase in performance when using SLI. While the everyday person may think that isn't much, if you consider the performance differece between a $300 and a $500 card is typically about 15-20% It makes since to SLI.



So now here's the big question.



If a 2-way will produce a 70% increase in performance over the original, what % will you get from a 3-way sli?



In math terms...



If performance from card X=1 then...

the performance from Card X 2-way SLIed = 1.7



Will 3-way = 2.4? or is in deminishing rate of return wher it will = 70% of 70% = a 49% increase for the last one? Or less?

#1
Posted 05/14/2008 03:09 AM   
I have usually only found an increase of 40% with dual card setup. Do have personal experience with 3 way sli. But it only really shows its colors in very high resolutions (1920x1200)
I have usually only found an increase of 40% with dual card setup. Do have personal experience with 3 way sli. But it only really shows its colors in very high resolutions (1920x1200)

#2
Posted 05/14/2008 05:16 AM   
[quote name='Tofu Guy' post='168991' date='May 13 2008, 11:16 PM']I have usually only found an increase of 40% with dual card setup. Do have personal experience with 3 way sli. But it only really shows its colors in very high resolutions (1920x1200)[/quote]
Cool. I'm looking at a 1920X1080. A 47" HDTV with 1080p resolution to hook up to it. Based on that Will 3 way sli show much improvement over 2way?
[quote name='Tofu Guy' post='168991' date='May 13 2008, 11:16 PM']I have usually only found an increase of 40% with dual card setup. Do have personal experience with 3 way sli. But it only really shows its colors in very high resolutions (1920x1200)

Cool. I'm looking at a 1920X1080. A 47" HDTV with 1080p resolution to hook up to it. Based on that Will 3 way sli show much improvement over 2way?

#3
Posted 05/14/2008 08:45 PM   
[quote name='Crossin Fingures' post='169264' date='May 14 2008, 04:45 PM']Cool. I'm looking at a 1920X1080. A 47" HDTV with 1080p resolution to hook up to it. Based on that Will 3 way sli show much improvement over 2way?[/quote]


I am utilizing 3-way SLI so I can power all the pixels in a 30" (2560x1600). I chose 3x 8800GTX's because of the memory bandwidth availible to push all those pixels with all details and AA....

@ 1920x1080, it churns out some really smooth and fluid framerates while keeping all details maxed out and plenty of AA.

I cannot say for sure the improvement you will see over 2 cards.

Chris (moderator) has a nice SLI-Sclaling article that does detail just that. The link is in his sig.


PS. I have learned you will need ample CPU power to support the tremendous strain of such a setup.
EXAMPLE: I overclocked my E8400 to 3.6Ghz... I thought everything was great, until I got it up to 4.0Ghz. This results in much improved framrates, smoothness, and get this: Lowered the temp's of my cards by 10c/ea!!

From what I read about the 9800GTX's, two of them should perform VERY well @ 1920x1080. Those can be purchased at great prices now.

Good Luck!


Sam
[quote name='Crossin Fingures' post='169264' date='May 14 2008, 04:45 PM']Cool. I'm looking at a 1920X1080. A 47" HDTV with 1080p resolution to hook up to it. Based on that Will 3 way sli show much improvement over 2way?





I am utilizing 3-way SLI so I can power all the pixels in a 30" (2560x1600). I chose 3x 8800GTX's because of the memory bandwidth availible to push all those pixels with all details and AA....



@ 1920x1080, it churns out some really smooth and fluid framerates while keeping all details maxed out and plenty of AA.



I cannot say for sure the improvement you will see over 2 cards.



Chris (moderator) has a nice SLI-Sclaling article that does detail just that. The link is in his sig.





PS. I have learned you will need ample CPU power to support the tremendous strain of such a setup.

EXAMPLE: I overclocked my E8400 to 3.6Ghz... I thought everything was great, until I got it up to 4.0Ghz. This results in much improved framrates, smoothness, and get this: Lowered the temp's of my cards by 10c/ea!!



From what I read about the 9800GTX's, two of them should perform VERY well @ 1920x1080. Those can be purchased at great prices now.



Good Luck!





Sam

#4
Posted 05/14/2008 09:45 PM   
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