Regarding GeForce 9500M GS

A very different specification shown on GPU-Z and Wikipedia, also on NotebookCheck

This is the Specification shown on my GPU-Z using my laptop:

While this is the Specification shown in Wikipedia:

And this is the Specification from NotebookCheck:

[b]

My GPU-Z shows its DDR2, Wikipedia shows DDR3, but NotebookCheck shows DDR2/DDR3.[/b]

So which DDR is it? Anything regarding over clocking? Please guide.