The Phenom II X6 1090T is a socket AM3 CPU, so it naturally takes a socket AM3 motherboard. And the HD 5870 will fit on ANY motherboard in existence with a PCI-E slot. If you want a good AM3 board, then might I suggest: http://www.newegg.com/Product/Product.aspx?Item=N82E16813131631http://www.newegg.com/Product/Product.aspx?Item=N82E16813128435http://www.newegg.com/Product/Product.aspx?Item=N82E16813131644