see the problem is not really that the motherboard is limited. this motherboard does create RAID larger than 2TB but the BIOS cant boot from it. as you know, MBR drives are limited to 2TB and thats the only type of HDD information the legacy BIOS can access to boot.
Windows Vista and 2008 x64 has brought EFI Boot support but its still limited by the fact that the EFI on the motherboards are not fully implemented to support this.
I say another 4 years... then we'll be able to boot to whatever size HDD we please.