I never lapped mine, was told it was not really nessary. We have the same case. I purchased 5 x 140mm fans from Petras and 1x80mm fan, plus the 2x 120mm fans plus I have two more 120mm on my heatsink. And I am about to purchase my last part.. a VGA heatsink for the 8800GT, there is one for $40 comes with two 80cm fans. Basically every spot I had for a 140mm fan, I used with a 140mm fan.

All my fans all spin around 800 - 1000RPMs, I am having problems with the Guru fan control, I want to Turbo everything, but I can't seem to do it. The fan speed is set by the default speed. My computer locks when I touch the Mode Select, it all started when I installed a 3 pin in my CPU fan. Maybe I need to install a 4 pin? When I did not use the CPU fan, I remember the Guru fan control working fine.

I have already lowered my Vcore again to 1.4150, haven't run Prime yet, but I did play about three hours of Gears of War.

I had no problem mounting my heatsink. I applied thermal compound on the heatsink only, I used a credit card to smear it around really thin and bolted it on. But just to put a fan in some of the mobo ports I have to take off my mobo completely, just way to lazy, but I will soon order a 4 pin fan.