I have got mine today.

Put everything together and woops my areca raid setup is not recognized by the board. Well actually it did work for one or two boots, funny i did boot into linux first because i thought linux doesnt really care about hw changes. It worked nice !

And all followup boot up's failed.

The bootup is as follows 5 beeps and inbetween the beeps it sounds like the board does make a reset. After the fifth time board boots up normally.

I have seen this behaviour on my DFI M2RS also when i put the areca into one of the x16 slots. Putting it into the x4 slot solved this problem.
On my new board i have got 3 more free PCIe slots but no matter where i put it in i have the same problem.....

Could this be an areca problem?