i got a mid tower Gigabyte X2 chassis Dimension 478x185x410mm my heatsink is acting pretty weird when i boot up....cpu temp goes upto 50 according to hw monitor and then the fan speed increases to 5000 rpm then the temp goes down to 41-42...so i am gonna buy two 120mm fans and a heatsink but i dont knw which is best , that will fit in my case and affordable