GPU core clock dropping
GPU core clock dropping
perhaps your running isn't always requiring full GPU power at the times you use it?
the questions you ask are a bit unclear.
maybe what you mean is similar to mine, where it doesn't stay maxed out but only uses what's needed when necessary?
http://imgur.com/OufJXAm
you could try 3dmark firestrike and run the test there?
http://imgur.com/Ak24Pbi