CPU heatsink placement issue

So, 20 days or so back I built a new computer and since my old one is about 5 years old there's so much more I can do now. I've been googling, googling and googling some more to see how I best can help my system perform its best and recently came across lapping and all that.

I've probably seen a few hundred pictures with lapped CPU's and heatsinks and also how the peoples rigs look like. I noticed that there's no universal way of mounting your heatsink, both ways seem to be popular.

My question is, what is the best way to mount my heatsink to not have one of the fans get burnt and also get the best cooling effect? Have two fans too close to each other and the stronger one will burn the weaker right?

I just RMA'd my memories and thought that I at the same time might lap the CPU so you'll have to live with the two CPU fans just sitting there






As you can see the space between the heatsink and the rear case fan is pretty small. Small enough to burn one of my CPU fans?

This is the fan setup:
Front : 230x30mm red LED fan x 1 / 700 rpm / 19 dBA
Side: 230x200x30mm standard fan x 1 / 700 rpm / 19 dBA
Top: 230x200x30mm standard fan x 1 / 700 rpm / 19 dBA
Rear: 140x25mm standard fan x 1 / 1200 rpm / 17 dBA
CPU: 120x120x25mm x 2 / 1100 rpm / 17 dBA

To mount the heatsink according to the 3rd and 4th picture may cause the rear case fan to burn the exhaust CPU fan? Also, if mounting the heatsink according to the 2nd picture there might be an issue with hot air from the nForce fan getting pushed into the heatsink?

considering the top fan, as long as both fans point to either the rear or the top of the case, you are fine.

In the bottom picture i have the same setup. back case fan blowing out, but i have the fan on the heatsink on the other side of the heatsink. It blows through and the rear fan picks up the freshly heated air just fine.

running a Q6600 at 3.6ghz like that, 53c under load

Noone experienced in the matter?