Im running a Athlon 1900xp in my MSI KT3 Ultra.
And an Athlon 2000xp in my Epox 8RDA+. (nforce2)
Neither are Tbreds.
So im not EXACTLY sure about your Tbred B 1700xp.
I assumed the cpu is multiplier locked, cuz your subject asked if the KT3 Ultra would Unlock it.
Which it won't unlock a locked multiplier cpu.
The KT3 Ultra does support multiplier adjustments.
So, i guess this is just a bump hoping someone with the KT3 Ultra/Tbred combo can answer your question 4 sure.