Ya know, I bought the Silencer 5 for $30 something and the fan broke a couple months after I got it. I bought it from BluebonePC and they barely speak english there so getting it RMAed through them, as Arctic Cooling suggests, would be a pain. I have been wondering the same thing about the silencer 4 since I saw they were on sale. If the mounting points are the same I could use the old backing plate and some of the thermal compund instead of the sticky pads. Please let me know if you can confirm it will fit on the X800Xl, I need a quiet computer again and that heat outside of my case!
Thanks,
Matt