I've got 2 machines that both run on ASUS mobos. The one with the Phenom II 965 is on a M3A79-T Deluxe. The 1090T is running on a M4A89GTD PRO/USB3 Both are OCed at 4Ghz and using 1.48-1.50 on Vcore. Both have the same identical aircoolers which are ZeroTherm BTF90's Both are in large cases with 5+ fans for air circulation.. Cool and Quite is disabled in the BIOS on both and are set to High Performance in Power Options in Windows 7 64-bit. The 1090T OCed at 4Ghz with a Vcore of 1.5 idles at 29-30C and when under load reaches a maximum of 53C. The 965 OCed at 4Ghz with Vcore of 1.5 idles at 52-53C and when under load reaches about 69C. Heatsinks both have been triple checked and can be interchanged with the same results. Using Artic Silver 7 for thermal paste on both. I'm totally confused that a Hexacore OCed at 4Ghz runs way cooler than a Phenom II 965. Is this normal?? I've got great heat transfer into the heatsinks.. The top of each heatsink is warm to the touch which tells me that the heat is being pulled away from the CPUs.. I just can't understand why the 965 would be running so much hotter with 2 less cores.. Run WinPrime on both for an hour and the 1090T barely gets over 55C. The 965 is cooking at 69-70C.. Should I be concerned?