The A8R-MVP mobo has a long list of problems that can be observed at the Asus user's forum and any other hardware forum, including vcore voltage instability. The icing on the cake however is that Asus has done nothing to fix the long list of problems after they advertised the A8R-MVP to be intended for "serious overclockers". read their false advertising for yourself.
Evidently "serious overclockers" at Asus must run their CPU at the default voltage because you can NOT under any circumstances increase the vcore voltage more than .1V above default, which is insane. DFI, Sapphire, etc. don't have vcore voltage or memory issues... The 2T memory and limited vcore voltages are crutches for a bad mobo design from what has been discovered on the A8R-MVP and now the A8R32 which has similar problems. The other ATI chipset mobos do not show the problems that Asus mobos show.
Asus has fraudulently marketed the A8R-MVP and the just released A8R32 has already been confirmed to have HTT, voltage, BIOS issues so you can see Asus has not got their act together. If ya do your homework you'll see
Asus has big problems with numerous AMD and Intel CPU based mobos so it would be wise to skip Asus for any new mobo purchases until they hire some competent engineers. The POS they have been hyping is anything but stable or reliable.