The gigabyte k8nxp-sli is better.. I have had the privilage to use both multiple times ( i built 4 or 5 a8n-slis at work ). The k8nxp-sli is superior quality. I've never gone wrong with giga-byte.. i'd recommend them to anyone. I've had more bad tyan and asus boards at work in 2 months than i have had bad gigabytes in my lifetime (i use gigabyte more often than asus and tyan too)