For this I used two heatpipes and the brackets from a Zalman heatpipe HDD cooler. The brackets proofed to be a good tool to bend and straighten the pipe to my needs.
Once the pipes were bent I used pliers to flatten the pipe to make it fit into the GPU-sink. Then I soldered the pipes onto the sink. For this I used the kitchen stove (no soldering iron beats that ). I guess the next pictures speak for themselves:
I know it looks kinda sucky, If i were to do it again it'd probably look a lot better. The heatsink has suffered a little from experimenting, but hey it works all great . The additional fan that I placed now blows directly on both the CPU and GPU heatsink, great isn't it?:
It's a Zalman OP1 slimline 80mm fan, which is only halve as thick as ordinary 80mm fans.
As for the temperatures, the fans don't start to blow very loud after a while anymore. This proofes that the temperatures are lower because that's what triggers the fans to run faster.
Besides that I also modded the psu brick. Mine had a very noisy fan in it and hardly produced any airflow. My idea: remove the fan and add a lot of ventilation holes:
About 230 3mm holes, and no fan . It was kinda tricky to make it work because the psu won't start without an rmp signal from the fan. Luckily this could be fixed easily: just connect the blue rpm wire to the black ground wire and then the psu and xbox boots without hesitation.
As you can see I've added small heatsinks all over the place, those are Zalman ZM80 VGA heatsinks. Also under the GPU-sink there are two ram-chips. To make them connect to the gpu sink I cut small slices from the pink pads on the bottom of the motherboards (they're thick enough). Naturally I used some heat compound to make sure they connect well to the sink.
As for the fans, I used rubber bands to absorbe the vibrations to make them more silent. Besides that I made them run a lot slower by connecting them in series, cutting their operating voltage in halve. By doing that they only need one outlet from the motherboard, so I could use the other one to power the intake fan on the side (with a resistor to slow it down). By the way, I carefully chose which fan outlet to use for which fan, or I could have created a positive feedbeck loop , haha (too much to explain).
To make the airflow more efficient, I placed a small piece of cardboard into the fanduct to force the upper fan to suck air from the gpu. I also cut away the metal grill behind the fan, and I made the holes of the plastic grill a little larger.
To make the silent treatment complete I (of course) flashed my dvd-drive with a firmware that makes it run more quietly.
Edited by Janneman84, 09 March 2008 - 05:45 PM.