So we have 2 floors with 1 cisco switch on each floor and fiber between them. On my main floor we have a 6509 running a WS-sup 720-3b IOS 15.3. On my other floor I have a 4507R and Im looking at purchasing a WS-X4516-10GE for its 10GE capabilities between the switches using fiber. I would add a WS-X6704-10GE to my 6509 to connect them. I assume we would be able to use our current fiber and get a 10 or possibly 20GB pipe between the floors. My questions is would all this work are the 10Gb modules between the 4507R and the 6509 compatible?