Raid controller

Good afternoon.
We purchased 4 disc WD30EFRX for our server on the Intel platform s5520hc.
Now it is necessary to choose for these disks raid controller raid 5, but can not find a compatible controller with our drives.
Prompt, which controller should I choose?

Welcome to the Community.

Are the hard drives not detected by your current controller? Are you prompted with error messages? What have you tried so far?

More information will allow for more Users to better help you.

Currently, there are sewn into the controller platform Intel s5520hc, but we do not want to use it. I would like to install a separate RAID controller.
And yet, the controller on the motherboard does not see the full scope of disks.