i think it has a gpu put into one of the pci slots and has integrated cooling, and then you pop in another nvidia card and put a sli bridge on em and you've got hybrid sli
-> sli'ing 2 different cards or sliing a video card with an igp. benefits are that it can shut down the powerful card and use the igp/weaker card for 2d graphics, etc. also it does provide a boost in fps.
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