Yes I know Connect X 'officially' has not been supported on ESXi5.x acoording to VMware: Firmware - Driver Compatibility Matrix.
http://www.mellanox.com/page/vmware_matrix?mtag=vmware_drivers
but I would like to know if anyone has tried C-X on ESXi5 and there are some issues on it.Checking old thread in this forum.I found this thread - it works good though It is not officially supported but there are some issues we must be careful.
http://community.mellanox.com/thread/1113
some issues or trials are updated lalely? please let me know the combinaton works good or not.