This is what I am trying to explain to you, if you want NO NOISE AT ALL you need a fanless heatsink... If you go with a Scythe or Turbo Twins you are just wasting your money, due to the fact they will emit the same noise as your stock cooler at 100% fan speed... so its a matter if you want 0 noise or keep the stock fan....
As far as upcomming coolers for the 4800 family I would not know, i dont use them....