Hello all, Yesterday evening I finally started building my rig which composes of Asrock z77 extreme9 motherboard, core i5 3570k CPU and thermaltake water2.0 pro cooling. After I finished everything and logged into windows, I wanted to see the CPU's temperature. I use "Core Temp" and it showed 65-68 degrees Celsius in idle. (max temp was 79!) Let me just add that I didn't overclock just yet. when I look in the bios to see the temperature is says 40 degrees Celsius. when I use the ASRock Extreme Tuning Utility to see the temperature it also says 40 degrees Celsius. The questions are: How is it possible that there is such a difference between Core Temp and the bios/Utility temperature? How can I know which one of them is accurate? What other utilities would you recommend to measure temperatures? Do you think that maybe if I installed Core Temp again it would show the same temperature as the bios? (I took the Hard Drive that I used in my other rig which already had windows and other software installed, including core temp, and used that in my new rig) Even if the bios/Utility temperature is right, isn't 40 degrees Celsius a little high for idle using water2.0 pro? Let me also add that I cleaned the thermal compound that came with the water cooling, and applied Arctic Silver 5 Thermal Compound. It's only about the 3rd time that I actually apply thermal compound so it's not like it's the first time, but it's not something I do everyday, so maybe something went wrong there also... In my other rig I have noctua nh-d14, so I can try and put it in my new rig just to test the temperature but it's a hassle doing it, so I'd like to not go this path if possible, unless you really think it's worth while. Thanks for reading this and I appreciate all your answers!