Supertiling - ATI Technologies X1900 - Radeon XTX 512 MB PCIE Video Card User Manual

106 CrossFire™ Rendering Modes
The first three are performance-oriented modes, and Super Anti-aliasing is
a quality-oriented mode. Each mode uses a different method for dividing
the workload required to render a 3D image across multiple GPUs. Only
one mode can be in operation at any given time.
The ATI Catalyst™ display driver will automatically select the best of the
three performance modes when a 3D application is started, without
requiring user intervention. The user can also choose to improve image
quality by selecting the new Super Anti-aliasing modes in the Catalyst™
Control Center.

SuperTiling

In this mode, each frame to be rendered is divided into a number of tiles in
an alternating checkerboard pattern, so that half of the tiles are assigned to
each of the two GPUs. Each tile is kept to a relatively small 32x32 pixel
square, so this method does a good job of balancing the workload across
each GPU regardless of what is being rendered on the display, doing so
without any software overhead.
1 PCI Express® Slave Graphics Card
2 Radeon® X1900 Series Master Graphics Card
3 Partial Frame Rendered on PCI Express® Slave Graphics Card