How to calculate the QuickPath Interconnect (QPI) bandwidth?

Question

For Xeon E5-2697 v2, Intel lists:

Bus Speed = 8 GT/s

# of QPI Links = 2

According to Wikipedia, one must know the QPI frequency and link width to calculate the QPI bandwidth, but these don't seem to be listed here. How to calculate it then?

Answer 1

I finally found an authoritative-looking paper (NASA- and SGI-affiliated authors) that explains it:

The total bandwidth is 8 GT/s * 2 links * 2 bytes per transfer = 32 GB/s in each direction, for a total of 64 GB/s.