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According to expansion options of the NUC, the PCIe is x4 lanes, note the picture below;
See here for the specifications Intel® NUC Kit NUC5i3RYH Specifications. You can also check the technical specification where that information is corroborated;
See here for the document http://www.intel.com/content/dam/support/us/en/documents/boardsandkits/NUC5i5RYB_NUC5i3RYB_TechProdSpec.pdf, go to page 43.
Thanks Amy. Somehow I missed that.
Amy, I can't figure out how to mark your answer as correct. DOH !
Now I got it! Thanks.