I have a Sapphire AMD HD 7770 and a Asus AMD HD 7770 2gb dual fan, after successfully crossfiring the cards ad enabling it through CCC there is a huge difference in bus widths and bandwidths of both cards, the Asus cards shows bus width as 128bits and bandwidth as 73.6GB/s where as the Sapphire card shows only 32bits of bus width and only 18GB/s of bandwidth,the card in the 1st PCI-e slot is the asus one and the other is occupied to the sapphire one and the DVI cable connecting my monitor is connected to the Asus card, I have latest drivers installed.
My system specs are:
RAM-corsair Vengeance 4X2gb @ 1600mhz
mobo-Asus Maximus V Gene
HD-Seagate barracuda 1TB @ 7200RPM
and sony 22x optical drive
And yeah even when gaming I dont see any significant difference whether CF is enabled or disabled, please help
Not necessarily. You get into an area of where (at the lower resolutions) you are CPU or GPU bound. Needless to say, but your GPU isn't operating at its peak efficiency when used at the lower resolution.
Also, the particular games you are playing have an impact here as well. What are you playing?