I did this with Prolimatech cooler, two Silverstone 121FM in push/pull at full speed. The Prolimatech is incredible, but require a lot of air coming through the chassis, from the front and outside the top behind. People that havent had the luck with these coolers didnt take the FAN part serious. Do that and you got something that can really do the job. And if you want to go extreme, you can always plug speedier fans.
The problem with all the H50, H70, H80 and H100 etc. are that most chassis arent really build for them. The radiator needs the cold air from outside the chassis, where the ambient temperature air will cool it down, not from the warm air (typically 15c+) generated from chipsets, graphics card, memory etc. - which produce loads of hot air when playing games. These radiators need to be equiped in the low front area or it the buttom of the computer chassis pushing air inside and that is not really the case on any of the configuration I have seen so far. To solve this you can remount the fans to push air in from the back, but that will ruin the ATX formfactor airflow. Furthermore you have a pump that generate a little heat sitting directly on top of the CPU, which doesnt really help the situation. The best of these I have tried though is the H80, which comes default with a push/pull configuration. Its just so huge that it will cover most of the VRM heatsinks if you equip it in you chassis where the normal FAN are sitting to make airflow. That makes the VRM heatsinks to be covered from the fresh air, which again is a bad point, especially if you do OC your system.
A friend of mine upgraded Alienware Aurora i7-975 with watercooling to a 2600k with a brand new H100, and the way they equip these radiatiors inside is just plain stupid. Both idle and game temps are horrible, and close to max on as low as 4.7Ghz.
No matter what you end up with, I would go for push/pull and be sure that you get a good amount of fresh air in, and be sure that it is sucked out in the upper back part of the chassis.
Since I took the screenshot I upgraded my cooler too, and I have it pushing air in from the front, it wont get heated because of the high velocity, and it will then be pushed directly over graphics cards, memory, chipset etc, from serious fans sitting on the inner side of it:
And thats with 140mm FANs on both side of the radiator doing push/pull. I did not have any heat issues, and I still dont:-)Edited by qwwwizx - 10/9/11 at 4:08am