If you want additional performance, in the vast majority of cases, you can gain it by adding on more rendering pipelines or a second (identical) graphics processing unit. Graphics applications and games scale very well with additional rendering power under the hood, as shown by both Nvidia's SLI and ATI's Crossfire technologies, which can be traced all the way back to the 3DFX Voodoo2, which was utilized the same core concepts.
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