So both cards will go full speed still? If that is true that makes me feel better. But I guess the real detail I am actaully confused about then what is exactly 8x and 16x?
X16 means there are 16 lanes running to a particular PCI Express slot, X8 means 8 lanes, x4 4 lanes and x1 is a single lane.http://www.enthusiastpc.net/articles/00003/
Check out this link for a comparison on a GTX 680 at x8 and x16. The difference is nothing to worry about at this point. http://www.hardocp.com/article/2012/07/18/pci_express_20_vs_30_gpu_gaming_performance_review/2