I use a £20 foxconn case for both my server and gaming htpc, my server I run my cpu passively with just a 120mm fan front and rear with 4 hard drives. My gaming htpc I have no case fans and my quad core 965be and 6850 run perfectly fine on stock cooling.
Temperatures on both machines are all well below the limits even on load.
Temperatures on both machines are all well below the limits even on load.