Thank you for contacting Intel Communities.
I was reviewing the specifications of your laptop and the Intel® Core™ i7-4800MQ Processor is not in the list.
In this case, even when the processor seems to be compatible (per socket, thermal design, etc), you have to consider other specifications such as BIOS.
I would recommend contacting the system manufacturer to check for any compatibility issues.
You can also check the following article for further information (it applies to laptops as well).
Intel® Desktop Processor Upgrade Information
I hope this information helps.
That is a bit confusing, because this specification (also official by Lenovo) has it on the list. There are also multiple notebooks with a 4800MQ on sale which appear to be original configurations. Now which list should I trust?
In this case, the best option is to contact the system manufacturer as they have different information for the same product on their own websites.
In addition, you can also discuss possible issues that you may face when installing a different processor to your laptop.