ATI CrossFire Technology White Paper
ATI CrossFire Technology White Paper ATI CrossFire Technology White Paper
Supertile Mode In this mode, each frame to be rendered is divided into a number of tiles in an alternating checkerboard pattern, such that half of the tiles are assigned to each of the two GPUs. Because the tiles are kept fairly small (32x32 pixels), this method does a good job of balancing the workload across each GPU regardless of what is being drawn on the screen, and it does so without any software overhead. Supertile Mode Supertile Mode has the advantage of being able to work with practically any 3D application. However, there are a small number of applications where the Supertile workload distribution does not provide optimal performance. For these special cases, Scissor Mode can be used. - 7 -
Scissor Mode In this mode, each frame is split into two sections, with each section being processed by one GPU. The split can be horizontal or vertical, and it can be even (50/50) or uneven (such as 60/40 or 70/30). The ideal configuration is determined automatically for each application. Scissor Mode Although in general Scissor Mode is a less efficient means of splitting the workload than the Supertile method, there are a few cases where it can be more efficient. It is supported by CrossFire in order to maximize compatibility and performance. - 8 -
- Page 1 and 2: ATI CrossFire Technology White Pap
- Page 3 and 4: Background The world around us poss
- Page 5 and 6: CrossFire - How it Works CrossFire
- Page 7: Alternate Frame Rendering (AFR) Mod
- Page 11 and 12: Super AA Mode 6x AA 12x SuperAA Com
- Page 13 and 14: Anti-Aliasing Sample Patterns An ad
Supertile Mode<br />
In this mode, each frame to be rendered is divided into a number of tiles in an alternating checkerboard pattern,<br />
such that half of the tiles are assigned to each of the two GPUs. Because the tiles are kept fairly small (32x32<br />
pixels), this method does a good job of balancing the workload across each GPU regardless of what is being<br />
drawn on the screen, and it does so without any software overhead.<br />
Supertile Mode<br />
Supertile Mode has the advantage of being able to work with practically any 3D application. However, there are<br />
a small number of applications where the Supertile workload distribution does not provide optimal performance.<br />
For these special cases, Scissor Mode can be used.<br />
- 7 -
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