well i am having the same problem with an Asus P8B WS LGA 1155 Intel C206 ATX motherboard. it runs an Xeon E3-1275 and otherwise is flawless.
Just like you say everything else works and you can install the drivers. But when you press Ctntrl G you do NOT get the next screen to set up your raid. Instead it crashes or boots into windows 7 on another drive i put in.
Have you found the cure???
Generally, updating the RAID controller firmware resolves this issue from the RAID controller perspective.
As I asked in your other community post, have you tried the latest BIOS for your server board? Unfortunately we have not tested the RS2WC080 in an ASUS server board. You can see what thrid party server boards we have tested in the RS2WC080 Tested Hardware and Operating Systems List.
Has ASUS validated the RS2WC080 RAID controller with this server board? If so, what do they say about the issue?
Reason for this problem is that ******* crazy mouse-clicky UEFI-bios of many ASUS (and some other) mobos, which does not let enough space in memory for sas/sata raid-controller bios to load. Users of LSI-controller 9211-4i (which is actually rebranded RS2WC040, or RS2WC040 is rebranded 9211-4i?) have the same problem. There is nothing Intel/LSI can do with it...