Linked by Thom Holwerda on Tue 15th Jan 2008 17:00 UTC, submitted by anonymous
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Member since:
2005-07-06
Because then you are not directly working with a single frame buffer, you either end up shadowing the frame buffer in main memory and have to copy that to the separate buffers in the video cards, or your software has to figure out which card it is drawing to on the fly.
Either method has a lot of overhead.