Yes, that seems to be the same issues with power management but it's not exclusive to Gigabyte motherboards... I had a Biostar that also buzzed, and since most the same components that go on AMD motherboards also go in Intels. As far as I now only the Chipset (NB & SB), socket, and maybe a few insignificant chips,.. the issue may occurr on all motherboards... maybe except for the more expensive motherboards since quality may be the only difference that makes up for the price. In any case the buzzing is said not to be damaging, but I don't like it because it sound like an alarm... anyone hearing it may think there's something bad going on. I haven't checked but it may indeed be an alarm since I have the CPU temp warning turned to sound at 60ºC and it may very well be it. I have to search for information that may or not confirm it.
What I'm thinking is that the power management may reduce power to the CPU so it's not always at full mhz and catching on may not be as fast as desired. Several settings that can be set to disable power management are the power management in windows, and on the BIOS:
• AMD Cool & quiet
• Hardware thermal Control
• CPU smart fan control
• AMD C1E Support
Disabling these BIOS settings would be like using a motherboard from years ago when such automatic power control settings were still not in use... and computers were very reliable.
That Kernel missing message is mostly always false... I have had it several times and when checking the system folder for the supposed to be missing file (ntoskrnl.exe), there it was. These type of messages can occurr when installing from a CD/DVD but not from USB, so try making a USB installer using Windows 8 USB Installer Maker, which can make USB installers for any Windows version, and it's quick and simple to use.