I am just looking at any possible solution that i can do becouse noise is too strong and i am runing out of ideas what to do. I will underclock card but i am sure that wont be enough, i need some solution where i can run fan speed max at 30-40% on GPU.
You can mount some big and slow fans on radiator, like 14cm and it will be pretty quiet. Also for maximum silence you need maximum size of radiator. Maybe something like this:
http://www.xoxide.com/watercool-mora3-9x140-ltblackradiator.html