What is the best choice for 15x

Hi I'm new to upgrading my 5 year old 15x, previously own by a friend which he had parts upgraded but I'm thinking of streaming league with the laptop which I had tried and result weren't too good. Fps dropped a lot when I start recording usually runs ok when normal game play. I understand there are ways to improve performance, but I was wondering with the current spec I have right now would I be better off getting new parts or a new computer.

Spec:
Nvidia gtx460m
i7 Q840
Ssd 256gb

Mainly...

What is the best choice for 15x