ギガのサンボルマザボの仕様でてる

GA-Z77X-UP5 TH
Audio: Realtek ALC898 codec
LAN: Intel GbE LAN chip (10/100/1000 Mbit)

GA-Z77X-UP4 TH
Audio: Realtek ALC892 codec
LAN: Realtek GbE LAN chip (10/100/1000 Mbit)

GA-Z77MX-D3H TH
Audio: VIA VT2021 codec
LAN: Atheros GbE LAN chip (10/100/1000 Mbit)

ってことはGA-Z77X-UP4 THで決まりということかな？

GA-Z77X-UP5 TH
http://www.gigabyte.com/products/product-page.aspx?pid=4279#ov

GA-Z77X-UP4 TH
http://www.gigabyte.com/products/product-page.aspx?pid=4280#ov

GA-Z77MX-D3H TH
http://www.gigabyte.com/products/product-page.aspx?pid=4281#ov