Do I have the correct graphic driver or the wrong one?

I have updated my graphic card and I felt that everything was fine until recently I found out that I have a decreased performance when I started gaming. Before I updated my gpu in the past, my graphic card was able to play dead space 3 in medium setting with a solid 30~60 fps and now I can hardly play left 4 dead in medium setting with 30 fps. I went over to device manager and I found out that AMD radeon HD7650M but the problem is, I am pretty sure I have AMD radeon HD6630M as my gpu.

So I have gone over to google to download a third party program (Speecy) in order to scan my driver and I got AMD radeon HD7650M as my gpu. I even went to my manufacturer's website to check my driver and I also got the HD7650M under the list of downloadable gpu driver! My question now is, is it possible for my gpu to just magically update to HD7650M or do I simply have the wrong driver for months? If that is the case, what should I do?

Ps: I am sorry for my English and please bear with me as I am an idiot when it comes to this sort of stuff.

Dell Inspiron N4110. Thanks btw :)

Yeap, I have entered my service tag and yes I have dual graphics. But the other gpu is Intel HD graphics though.

So what you mean is, I should uninstall my current driver and replace it with HD6630M?

Alright, thanks for your help!