According to pg23, 3 BUFGs are used for PCIe Gen3.
But that's true only for 2014.2. In 2014.3, the gt_wrapper will initialize 4 bufgs. How to eliminate those BUFGs?
In 2014.3, there is a problem in GT that got fixed.
The implementation that was given resulted in a per lane BUFG usage.
I belive this got fixed in 2014.4. can you check it ?