Say for instance I decide to put a triple slot height graphics card in my 2012 Mac Pro, the second 16x slot would be blocked. Could I use a PCI-E extension cable to make use of the second 16x slot? I appreciate any PCI-E device wouldn't have a 'secure slot' but it could be secured in the case by other means. The triple slot card would be this or similar: I've been looking at something like this: http://compare.ebay.co.uk/like/350646292475?var=lv<yp=AllFixedPriceItemTypes&var=sbar&cbt=y Anyone have experience of this? Is it possible?