Thats the thing though my first one i had was super quiet, but the hdmi input failed so had to get a new system. Since then i have returned 3 consoles to Amazon and all of them have come back and been much louder than my initial console. The last time i got a replacement from Amazon they sent me a email saying they noticed that i have made a lot of returns recently and wanted to know why, so i think there getting annoyed and probably wont return another one if i said the reason was because of a noisy fan.
Also i doubt Microsoft would replace the console due to it being loud also, so after reading a few post on various forums of people apply new paste and getting good results i thought id try the same.
Wasnt there a law past recently saying that manufactures couldn't have warranty stickers on their equipment anymore and refuse to fix if the sticker had been tampered with?