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Multi-GPU is the collective term for various technologies with which the computational effort for the display of 3D computer graphics can be divided between several graphics chips or graphics cards, provided that these are available in the respective computer configuration. Each manufacturer markets its technology under its own name:

Overview of multi-GPU technologies
Manufacturer designation abbreviation
3dfx Scan Line Interleave SLI
ATI Alternate frame rendering AFR
AMD Crossfire XFire
ATI Multi rendering AMR
NVIDIA Scalable Link Interface SLI
Metabyte Parallel Graphics Configuration
S3 Graphics MultiChrome
XGI Technology BitFluent Protocol

In principle, there are the following operating modes for multi-GPU operation: