Toshiba L670 CPU upgrade options

[BennyGL]

Hi, 

I would be very appreciative if someone could help with CPU upgrade options for a Toshiba L670 (PSK3EA-08X017)? Bios is here:

https://support.dynabook.com/support/modelHome?freeText=1200014255&osId=3333728

I've attached screenshots from CPU-Z

I currently have a I5-480m and I'm pretty sure a i7-640m would be OK. However, I also wanted to know if any of the following would work?

I7-720QM
I7-740QM
I7-820QM
I7-840QM
I7-920XM
I7-940XM

I know the TDP is higher so cooling could be an issue even if these do work. 

Thanks very much

[DeathBringer]

I've attached screenshots from CPU-Z

You haven't. And I need a screenshot of list of graphics cards in Device Manager.

I think that quad cores CPU will overheat this laptop.
To check it you need to stress current GPU and CPU simultaneously: run Furmark & LinX (with idle process priority).
Make screenshot of HWMonitor when GPU & CPU temperatures will stop rising.

[BennyGL]

Hi, 

Thanks for the reply, I had a quick run of Furmark and LinX simultaneously and was getting CPU temps up in the late 80's and early 90's. I will run for a longer time soon and post images shortly. So as you predicted the laptop could overheat with the quad cores. 
 
I've tried again to add the attachments of the screenshots as I think I messed it up last time.