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38 CrossFire
™
Rendering Modes
Although Scissor Mode is generally a less efficient means of splitting the
workload than using SuperTiling, there are a few cases where it can be
more efficient. It is supported by CrossFire
™
in order to maximize
compatibility and performance.
Alternate Frame Rendering (AFR) Mode
In this mode, all even frames are rendered on one GPU, while all odd
frames are rendered on the other. The completed frames from both GPUs
are sent to the Compositing Engine on the CrossFire
™
Edition card, which
then sends them on to the display. By allowing both GPUs to work
independently, AFR provides the greatest potential performance
improvements of all the available modes. It is also the only mode that
allows the full vertex processing performance of both GPUs to be
combined.
4
Partial Frame Rendered on PCI Express
®
CrossFire
™
Edition
Graphics Card
5 Final Rendered Frame on Display
1
PCI Express
®
CrossFire
™
Compatible Graphics Card
2
Radeon
®
X1950 XTX CrossFire
™
Edition Graphics Card