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That issue you said, if its only with Voodoo then the problem is with Voodoo but if happend in other system manufacturer then its the Nvidia's fault.
 
Also i will edit this FAQ with new informations about SLI/CrossFire

Just wonder do PC games that support multi-gpu configuration (SLI or Crossfire) really experience better Visual Graphics then PC games using single graphics card. Looking for anyone that can give me real world experience answer in this area.

Well in some cases the difference is alot, for example in Crysis when you play at 1920x1200, for example 2 8800GTX perform alot better than one 8800GTX and you will see/notice the difference.

Edited.

Edited with a new chart.

I think it would be nice to have a bit about multiple monitors as well.
 
1) You have 2 or three monitors and two GTX 260s or 3870 X2s . Lets say your middle monitor is 30" and the side monitors are 20-24". Let's also say you have three 20" full screen.  
 
What are the possibilities for gaming? For gaming, will the side monitors be disabled and both cards will power the single monitor? Will all three monitors remain active with the primary monitor getting a boost from the second card? Can all three monitors be used in any game without a solution such as TripleHead2Go?
 
2) What about dual monitor support? How do these multi card solutions work with them?
 
I've been told that ATI supports triple monitors by allowing the side monitors to be disabled automatically, whereas Nvidia makes it a pain.  
 
I don't know any of these answers, but sure would like to know. I think it would be a great addition to your fantastic FAQ.

Well i want to mainly talk about MULTIGPU itself and the advantages/disadvantages of this technology and other things.I want to focus on this not on the monitors sorry .

But doesn't crossfire and SLI have variances in their support for multiple monitors, which would influence the decision to use one or the other? Or is your focus to be whether or not to use a single card or multigpu and not crossfire vs. sli?

Well i know what your are talking about, but i as i said i want to tell about the advantage and disadvantages of both technologies,and the motherboards and other "Inside case" components.
 
Anyways thanks for your idea

Edited
Now i put both Deskop and Notebook's "MultiGPU Compatible" cards.
For AMD/ATI,there isn't still a card capable of MultiGPU support.

Edited with a new charts and some card updates.

hi im new to this but i need some help, i have just bought another evga 8800 gts 640mb acs3 ko edition and ran 3dmark06 (Full version) with a single card i get 9724 but when i sli them i get 9089 thought thats abit strange. here is my rig
 
e6850 x2 3.0ghz
6gb adata ddr2 800 6400
evga 680i mobo
2x 8800gts ko sli
500gb hdd
coolmaster 650w psu
 
i thought with sli i should be pushing 12k
the sli is all setup ok

I dont think there is a problem with your system,when you run 3DMARK, you run it in 1280x1024 resolution which barely benefits from SLI,so you can do something else,you can run it with higher resolution like 1680x1050 or 1920x1200 and then you will see it will benefit from SLI.
 
Also don't worry about 3DMARK so much,run some games and see what will happen,playing games and getting good FPS is more important than 3DMARK.

What about 3870,and 3850,how do they work together ?
 
Can you have more than one 3870 or 3850 when there is a 3870 and 3850 crossfire in  your computer?

If you look at the chart at the first page,you will see that HD 3870 can be used in CrossFire with another HD 3870 or HD 3870X2,and HD 3850 can be used in CrossFire only with another HD 3850.
 
So you can't use HD 3870 with HD 3850 in CrossFire mode.