This store is almost live. For now no orders will be fulfilled.
The 6 Gb/s PCI 2.0 cards are suitable for all servers. Also for the servers with the 12Gb/s backplane. When you for example use ZFS as a filesystem there is for normal use no need for the 12 Gb/s controller/backplane. If you want the highest speed or you are in doubt you can always opt in for the more recent and more expensive 12Gb/s backplanes and cards.