If you are 100% sure it's coming from the Titan send it back! What brand?
The Titan cooler is really good it's similar to the cooler I have on my 780 ti and the 780 that I upgraded from.
Both of these cards were quiet and didn't make any noises.
Coil whine and buzzing noises happen on the high end reference Nvidia coolers very rarely, these problems are usually associated with windforce cards and cheaper plastic non reference cards.