(Probably) simple RAM question.

[CKsquid]

Ok at the moment my pc has 4gb ram installed.
It is DDR2.
My pc has a dual channel memory thingy, and only the two blue slots are take. (by the two 2gb rams)
My two orange slots are open however.
Now. my question is, can i install DDR3 memory into those two orange slots?

 

[Cygnus x-1]

You can only run ddr2 or ddr3, mixing will not work.

 

[Branden]

ddr3 sticks won't even physially fit in ddr2 slots.
ideally, get sticks identical to those you already have.

 

[Cygnus x-1]

I'm guessing he has a hybrid board, like the p5kc.