Hi I've upgraded my GL40 Chipset Acer Extensa 5630Z from a T3400 (Merom/65 nm) to a T8300 (Penryn/45nm). Fan kicks in now 5°C earlier (according CPU-Temp). T3400 has Tjmax 100 while T8300 has 105. I wonder if that is the reason. Integrated graphics clock is now 475 MHz, with T3400 it was 640MHz (GPU-Z). Is that because the T8300 runs now with a 800 MHz FSB instead of 667 MHz (T3400)? On the T3400 Core Volting dropped under 1.0 (0.950?) Volt when idle. 1.0 Volt is lowest for the T8300. HWInfo32 says: -that my T8300 is able to go down to 0.950 Volts (SLFM/DynFSB). -that my T8300 supports IDA but is IDA is red (disabled). -"Intel Dynamic FSB Switching" is also supported but disabled. -Enhanced SpeedStep is enabled. I wonder if I could optimize the settings for the T8300 with an "unlocked" Bios where the Menus for Intel etc. are visible and adjustable. thanks for some infos.