Will 2nd Card in SLI Run in a PCIe 3.0 x4 Slot?

I'm thinking about getting the PCIe 2.0 x2 RAIDR Express for my Maximus VI Formula but the board's 2.0 slots are x1 so...I'll have to install it in a 3.0 slot to avoid a performance hit.

Configuration: 1st card x8----2nd card x4----RAIDR x4
How much bandwidth does the SECOND graphics card NEED in SLI? Can it hit PEAK performance in a PCIe 3.0 x4 slot or would it need x8 as a minimum?
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More about 2nd card sli run pcie slot
  1. Maximus VI formula must be x8x8. You should be fine with this since the board is SLI certified!
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