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Thank you for the post. I would suggest you to un-install Intel driver then try check with Gigabyte for their latest customize driver. Have you tried upgrading the board BIOS?
I tried both the driver on the bundled cd-rom and the driver on the gigabyte website, to no avail. Both are intel drivers as far as I can tell by the way.
The latest revision of the motherboard bios only adds support for newer CPUs so I doubt it'll change anything with the network controller.