Here is my RAM's speed,
Seriously, I am not really think that the Hyundai RAM is reliable, as same as their cars
Another question, how can I make my pics bigger?? They are so small = =
Anyhow, let me give you some good news: your ram is DDR800 already, not 400. We say DDR800, but it's actually @400MHz double data rate => so DDR800. GPUz shows your ram is @400MHz so DDR800. Add another stick of DDR800 and they will all work @DDR800, so at 400MHz.
*EDIT I was having some doubts you could have DDR2-400, since they are so rare and weak. Most DDR2 sticks begin at 533 up to 1000.