Crossfire and SLI scaling question

[flooberjobby]

Wich one scales better from just plain SLI or Crossfire to Quad SLI to CrossfireX(I like calling it QuadfFire).

I been wondering for a while now, about the scaling of each, and wich one scales better and to what extent with added GPUs.

I've allways thaught Since ATI got into the hole multi gpu setup that they had better scaling and implimentation of it.

I also am wondering what happend to the onboard Crossfire they had in the 2xxx series. Where they just put the cards into the mobo didn't have to mess with dongles or bridges and it just did crossfire through the mobo. I think it was in the Xpress PCI-E slots. I wonder why they stopped that.

 

[Zero82z]

Crossfire and SLI scale pretty much equally, including when it comes to four-GPU setups. Both CrossfireX and Quad SLI have pretty poor scaling. However, if the rumours are true(and it's looking like that will be the case), the upcoming R700/4870X2 card will have seamless CF, meaning the two GPUs will act as if they were one. That will also mean that 4870X2 CF should remove the scaling issues with a 4-GPU setup, although only for those specific cards.