Alienware m18x R2 CPU upgrade question

Hi all ,

ok so i have cancelled my order and decided to go all out and go for the AW mothership !! m18x R2 . Now when i was configuring my system i really wanted the 3920xm but was not going to pay the massive high premium AW wanted ! so i researched into the build etc .

This is where i need a AW Tech or someone who knows the insides of the m18 R2 very well , as i am aware after researching the 3820QM uses a 2 pipe copper cooling system , where the 3920xm uses a 3 pipe cooling system

My question silly as it sounds , do i need to get this 3 pipe cooling system ( dell part number 0MXJ5 ) or can i run it without upgrading from the 2 pipe system already supplied ? reason i ask i can get the 3920XM for £460 and really want to get it , but worried i will burn it out with incorrect cooling .

Thanks in advance