sorry for swearing-im new!(neva eva)

Ok My mobo is Asus K8U-X and it support the 400mhz.
One more thing:When I put one RAM into slot it works at 400,problem is when i put two-then it falls down to 333mhz.
Im running with only one RAM since yesterday,maybe something will change when I put the oder-(i dont know how to spell that) one.