MATROX 原廠網頁已經講明了，可相容 AGP8X ，但
是幻日還是跑 AGP4X 而已。

http://www.matrox.com/mga/products/parhelia512/home.cfm

寫在最下面：

Parhelia-512 is compliant with AGP 8X motherboards, but currently performs AGP 4X data transfer rates