Dell N5010 upgrade to i7 for better video playback?

[ryderbg]

Hello! I would like to play 1080p 60fps on my old laptop and I believe better CPU will handle it. Last week I replaced i3-370m with i3-380m on DELL N5010. It's not big deal but theorically is better. Now I want to upgrade to i7 but cannot decide which one. I know there are N5010 variants with i7-740qm but I am not sure if it uses the same motherboard since that CPU has 45w TDP (10w more) and it is quad core. The other option is i7-640m which is still dual core and has also 35w (same like mine at the moment). Also my laptop has ATI HD5650 gpu.

 

[ryderbg]

I just upgrade to i7-840qm. It worked. The temp is max 80c at 100% load. But the problem is that when install video card driver and restart to take the effect it goes black screen after windows logo. Any idea what do?