About CrossfireX

ABOUT CrossfireX

CrossFire main advantages if compared with SLI is that the CrossFire vga card does not need to GPU is based on the same but there are some limitations, namely whether vga card can be used together?. 

Cutting: This mode is similar to the SFR (Split Frame Rendering) from SLI, but because you can hook two vga under CrossFire, half of the screen provided by the vga the fastest will be the first and vga must wait too long to be able to complete its task to forward to the next frame. This will make the video more quickly to work in the same vga a slower speed. To overcome this problem, CrossFire allows dynamic load balancing, that is if the card quickly connected with a slow, then the system will not display as the two share the same part, will be faster to enter the vga than one screen, so for them to complete the rendering on the the same time. 

SuperTiling: In this mode the screen is divided into several small part squared (or "tiles"), each measuring 32x32 pixels, and each vga in charge of handling the available tiles. Load balancing is also used here, so the fastest card will get more tiles to make the card slower than if you use two video cards. 

Alternate Frame Rendering (AFR): This mode is identical with SLI mode with the same name, in which time one of the video card is rendering the current frame, the other card rendering the next frame. 
Super AA: AA is equivalent to the SLI, this mode allows improvement in image quality, not performance. You can increase the AA (anti-aliasing) to the x14 this mode. 

Just like SLI, CrossFire is only available for PCI Express card and you must have a motherboard with two or four PCI Express x16 slot and the motherboard must be based on the AMD / ATI or Intel chipset. Please note that depending on the chipset PCI Express x16 slots can run at x8 speed when CrossFire mode is enabled (more on later). 

Also when CrossFire mode is enabled only one video output is available, so that you can not have multiple monitor configuration under CrossFire, only one screen 

Hybrid CrossFireX technology with the nVidia's GeForce Boost. This is intended for low-end system with on-board video motherboard. When you install the "real" vga compatible with this technology, the system set vga vga and on-board to work in parallel in CrossFire mode, improve the performance of gaming. 

As it happens with the pair of nVidia, you must have a motherboard that is compatible with the chipset and also vga that support this technology to use them. So far, only motherboards based on AMD 780G chipset and video card is based on the Radeon HD 2400 and Radeon HD 3400 series is compatible with Hybrid CrossFireX. This technology only works under Windows Vista.