hi, the side fan is intake, blows on back of the graphic card and motherboard northbridge, keeps both of them cool.
My Idle temp at the moment is 33C with room temp at 30C and my full load temp is 38C with 2.6 running at 3.25Ghz and this is during rthdribl kept for rendering in background. I am yet to see it go over 40C since i got the watercooling.
The most I have seen is during DOOM3 when it reaches 39-40C thats it not more.
I got watercooling through 1 distributor. Cost was around 4.7K. He imported it for me from australia but now this is available here. hard to find but you will find it in mumbai. Some days ago there was article in CHIP where they gave contact no of the dealer who sell them here. i will try to search it.