Coil whine on GA-Z68AP-D3 if C1E, C3/C6 state and EIST are enabled

[Saekerhett]

I have this really annoying coil whine on a GA-Z68AP-D3 motherboard with BIOS F7. This whine only occurs when C1E, C3/C6 state and EIST are enabled. If they are disabled, the whine disappears, but my CPU (2500k) is running at max speed continuously.

Somewhere I read this happened to more Gigabyte motherboards and that it could be solved with a BIOS update. Is this also the case here? I know there is a version F8 for my motherboard, but in the changelog nothing is mentioned about a possible fix.

Specs:
Gigabyte GA-Z68AP-D3 with BIOS F7
i5 2500k @ stock
MSI R6850 Cyclone
8 GB Corsair DDR3-1600
OCZ ModXStream Pro 600 Watt
Crucial M4 256 GB SSD
Windows 7 Ultimate x64

Thanks

[he1senberg]

I remember this happens with X58 too, my old Gigabyte X58 has this "issue", and my anothers two X58 from EVGA and Asus too, but more more quiet.

I think it's not a problem with your system.

[Saekerhett]

I remember this happens with X58 too, my old Gigabyte X58 has this "issue", and my anothers two X58 from EVGA and Asus too, but more more quiet.

I think it's not a problem with your system.

Ah thanks. I didn't think it was a huge problem, if it's not uncommon and a BIOS update can't solve it, I will just leave C3/C6 disabled. I read some more and apparently it's only C3/C6 that causes this problem. So I can turn EIST and Speedstep back on if I want, gonna try that when I'm home.

But it remains strange, those whines should not be audible.