DDR2 mobos/CPU backward compatibility

[Phrik]

If a MoBo says it has DDR2 slots, is it also backward compatible when I use with DDR1s

Is it also like that with the CPUs, can Core 2 Duos or Pentium Ds understand DDR1s ?

Or if it says DDR2 it will only work with that ?

 

[shockwave827]

DDR2 and DDR1 are not compatible w/ eachother. Can't use DDR1 and 2 on the same board unless you have one that supports it like the asrock boards.

 

[kirbyrj]

If a MoBo says it has DDR2 slots, is it also backward compatible when I use with DDR1s

Is it also like that with the CPUs, can Core 2 Duos or Pentium Ds understand DDR1s ?

Or if it says DDR2 it will only work with that ?

DDR1 and DDR2 memory have different slots. You wont be able to fit one in the other. As the poster above me noted, some boards do have both DDR1/DDR2 memory on the same board, but they are mostly Via based motherboards.

Intel CPU's can understand DDR1/DDR2 because the memory controller is in the northbridge. AMD CPU's (current ones anyway) can only use one or the other because the memory controller is on the CPU. s754/s939 = DDR1 and AM2 = DDR2.