I just wanna share my (interesting) results with the cx3 boards.
So, first of all, I've got a pair of cx3 mcx354A-qcbt - 40g ib and 10g ethernet.
Well, tweaking the ini, I got the cards to work at 56gbps ib or ethernet (mind you, 56gbps is a mellanox proprietary mode and it requires...
For the (un)lucky of you to get a ConnectX-1 card, I've found this firmware buried deep into the MLNX site :
Also - iso's for mlnx ofed - firmware included here http://www.mellanox.com/page/firmware_table_IBM_archive
the firmware is...