I have a homebuilt system with an Intel i5-750 (not OCd, stock heatsink). There is a persistent, high-pitched, but not loud whir coming from the tower (noise does not vary with load). Other components include: Intel X25-M, 5770, Gigabyte P55M-UD2 mobo, and a Corsair 450w PSU. I had a similar noise coming from my T61, but this was resolved by disabling ACPI. This option is not available in BIOS, as expected. I have heard that the Intel whir is common but am unable to solve the issue.
Help would be greatly appreciated.
Edit: I just noticed that the noise only occurs when Google Chrome is running. (???)
Edit2: Disabling C1E and EIST and Intel Turbo Boost got rid of the whir, but now my average CPU temp is ~5║C higher and my HSF is louder. Should I be concerned about increased power consumption and heat?