how to upgrade toshiba c855d-s5340 processor

[Jasonx72]

What can it be upgraded to?

 

[jghaverty]

To be blunt, on low end laptops, you're mostly stuck. Even if you overclock or get a new cpu, anything you do will be limited by not having a discrete graphics card (that you can't add). I would say leave well enough alone in this case.

It uses an old platform thats not relevant for upgrades anymore, so theres no cost effective solution for you. (i.e. Im never going to recommend you drop 600$ on a 300$ laptop, sorry).