I snapped a bunch of cisco transceivers and in the package were also some 8GB SFP. I know that the SFP+ modules are used in ethernet and the 8G SFPs are used in FC/SAN-Networks. Since I just wanted the other transceivers I have left the 8GB ones for three days just in box.
this switch should have a very good price currently on 950€ bidding. The switch is from the description only 7 months old and used in a datecenter for 1 month.
IBM/Lenovo RackSwitch G8264 / OpenFlow (48x 10Gb SFP+ & 4x 40Gb QSFP)