The P4DC6+ motherboard has onboard VRM (voltage regulator module) with zero channel RAID option support. The P4DC6 motherboard uses add-on VRM modules and without zero-channel RAID option. We recently released P4DC6+II which is the same as P4DC6+ but it can support up to 3.0GHz 400FSB CPU compare to 2.4GHz on P4DC6+ and P4DC6.