Ive just installed this. And at first i thought everything was smooth once installed, but now im not so sure. And i know what everyone is going to say, reseat your pump. But before i go through all that hassle right away. heres the weird thing. Idle temps are all with in 1 or 2 degrees for each other, full load temps are all with 1 or 2 degrees of each other. Mid load cores 1 and 3 are with in 1 or 2 degrees of each other but 10 degrees warmer than cores 2 and 4. CoreTemp shows that these are 10-15% load. Now i had to install the H50 pump upside down, so the tubing is at the top of the pump and on the bottom of the radiator. And i noticed these temps in L4D2 if that helps.