Thanks to this forum and fohdeesha, I have installed my converted 649281-B21(now a MCX354A-FCBT) Network card in my QNAP NAS and connected it at 40GbE via the
Brocade ICX6610-48P. I am using the NetApp 112-00178 X6559-R6 External SAS Cable to connect the two devices.
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Still running tests on performance, but so far everything is working perfectly. Contemplating enabling Jumbo frames, but reading some of the replies on this thread, not sure it is worth the hassle.