Ok Larry, stick to that belief and good luck to you.
SatPak, you are wrong.
Larry is correct. (in most if not all states.)
In my state, you can be convicted of DUI (or OMVI) for being "appreciably impaired". That is what must be proven in court. It could be proven by witness (including officer) testimony, field sobriety results, circumstantial evidence, slurred speech, etc.
You are also in violation of the DUI (or OMVI) law if in violation of the "per se" law, which means having a blood, breath, or urine alcohol concentration in excess of state limit (.08% for breath.)
As Larry stated, you can be tried and convicted of both charges, but only sentenced on one.