Want to install new ram in Macbook

[HamburgerTrain]

I bought a Macbook in 2008. It runs on Snow Leopard and it is version 10.6.7
The processor is 2.4 GHz Intel Core 2 Duo
The RAM used is 2 GB 667 MHz of DDR2 SDRAM

I've read that with an Intel processor, I can use other brands of RAM, but my question is, can I use DDR3 RAM on this Macbook with these specs?

Thank you

 

[Kaveman]

667 MHz of DDR2 SDRAM

Its best not to mix them, this is what you want.

 

[Kaveman]

Just confirmed with my Tech, she said the DDR2 and DDR3 are NOT compatible at all! They won't fit into each others slots.