I present you my silent XBox 360 Cooling Mod The primary goal was to get maximum silence and still keep it cool. I used an old Xenon XBox 360 and I performed the following modding steps: - JTAG - remove DVD drive - replace 20GB HDD with a new 250GB HDD - replace X-Clamps with screws and renew thermalpaste (Arctic Cooling MX3) - rebuild fanducts for back fans - add fanducts for top fans - add fan control, variable from 5V to 12V, accessible by removing the faceplate - add four 80mm fans (Arctic Cooling F8 and F8 Pro) running at 7V now - provide the PSU with passive cooling The result is a now really silent XBox360. The four fans running at 7V provide enough cooling for everything, idle temps are 52°C CPU and 46°C GPU. Idle temps before the mod were 70-80°C for both CPU and GPU. Watch a HD-Video of the XBox360 in action, with before and after comparison: http://www.youtube.com/watch?v=-SryUclRrB8 Pictures of the modding process: planning in sketchup: bad boy R6T3 had to go: old thermal paste, before and after cleanup: cutting the backhole: fits perfect: adding top fans and fanducts rebuilding the rear fanducts I used 1mm polystyrol sheets, easy to cut and glue: getting 12V power for the fancontrol: the fan control: power connector for the back fans: provide the psu with passive cooling, I used an old CPU heatsink (I didn't have anything smaller ): the passive cooling seems to work fine, after a two hour test session, the heatsink was getting hot, but you could always touch it without problems, I would guess something around 40-50°C Hope you enjoyed it.