...I might have a bad taste in my mouth about Giga AM3+ motherboards. They have not been absolutely straight up with their customers and talked out of both sides of their mouth. Rev 3.0 of your model of motherboard has been a true pain to most of the customers. Look for what they had to do to stop them from throttling. And when the user contacted Giga, Giga told them there was nothing wrong that the boards were built according to AMD specs. WoWee. That might have been a fine answer if every other brand of AM3+ mobo acted just like the Rev 3.0 boards of the model you have acted. But that was not so.
So everyone of us that works in here mostly 24/7 for free to try and help, spend a lot of time with Giga board users that we do n0t have to spend with most other brands except MSI.
So then we fast forward to your Rev 4.0 board today and after a bios flash you can change the CPU_NB speed in bios but in reality it is not changing. The CPU_NB multiplier appears stuck at 10x. Most other boards will use other than 10x multiplier.
I suggested and you verified that raising the FSB aKa HT Ref Freq or Buss speed might then raise the CPU_NB. Raising the FSB does in fact raise the CPU_NB by a factor of FSB times the unadjustable 10x CPU_NB multiplier. Good for it. At least you will not have to do without any free benefit from a faster CPU_NB. That having to resort to some form of work-around with too many Giga AM3+ motherboards, can after all these years now over 3 years that the FX processors have been in retail, give one a slant away from certain boards.
Now over time that slant may seem aimed at a 'user' but the truth is not so. However I do get tired of users begin taken advantage of when revision after revision only brings some other broke thing, even though something else may have been fixed.
That said, you know how to get more CPU_NB speed, is to lower the cpu multiplier and raise the FSB and keeping ram and HT Link speed within specs, you can then get some more CPU_NB speed. The shame is that most boards will allow raising the CPU_NB speed and report same raised speed in the software we use to see what is going on with the motherboards. Raise FSB and drop the other three busses to keep them within specs and get the benefits small or large from greater CPU_NB speed. And good luck to you.
RGone...