so i have a evga z68 sli board, and i heard the 2600k has 16 lanes for pci-e, so i have gtx 580s in sli at 8x pci-2 2.0, i also have a sound card in the 1x pci-e slot, so if the cpu only has 16 lanes of pci-e, how do the 2x 580s and sound card work (17 lanes in all).