What is PCIe 2.0 x16 slot operates in x4 mode? for SLI.

what is the different if i put another graphic card in this slot? is it the performance affected?

because it operate with 4 mode. another slot with 16 mode. i plan for SLI.
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  1. yes you will lost performance, but it is nothing much noticeable:
    http://media.bestofmicro.com/6/P/284065/original/image027.png

    there it a graphics showing performance loss, 8x/8x vs 16x/4x
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