It took him only for my little laptop which I use as a pure surfing machine. So I have measured neither speed, nor have I seen how well you can overclock it.
For me it is just important that I now 8GB instead of 4GB RAM have.
And this is the case.
In my HP655 Notebook he was immediately recognized and displayed correctly.
Because that's all that matters to me there are 5 star for (me) full compatibility at an affordable price.
Greeting
Sodaplexus