Hmm, looks like you don't know Effective/real clock speed is, I'll gladly explain it
Real clock is the 1045 you see in your program, effective is the 3.6ghz (because of the GDDR5 you multiply by 3. something).
It really runs at 1045, but its effectively 3.6ghz because of the GDDR5 (kind of like extra cores, when people who don't know any better multiply it)