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EDT 8-lane PCI Express boards will fit in 1, 8, or 16-lane slots. In 8 or 16 lane slots the boards will work at their rated bandwidth. In 1-lane slots the bandwidth will be reduced to roughly 1/8th the maximum. 8-lane boards will not fit into 4-lane slots that follow the PCI Express specification, due to the location of the edge connector dividers. To get around this, some computer manufacturers provide slots with an open back end of the slot (the end furthest from the board's/computer's backplane. EDT 8-lane boards should work in these slots, however it is up to the user to verify any non-standard configuration.
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