About the only upgrades would be an i7 CPU and a larger SSD -- you're at the max for RAM and the GPU is not upgradeable. You'll need a  socketed 4th generation mobile i7 like the 4600m if your intent is a CPU upgrade.  
I just want to know what exact parts I can upgrade for my laptop, so far its 16Gb DDR3 ram (1600 MHz) intel core i5-4310M CPU 2.70 GHz Intel(R) HD Graphics 4600 256 Gb SSD  I just want to upgrade any parts I'm able to, so it runs better. I only use my laptop for Unity game design at the moment and sometimes play older games like fallout new Vegas (26-41 fps) people playground (50 - 82 fps) project zomboid (19 - 30 fps) Albion online (20 - 50 fps) Unity engine depends on the project size and settings for fps. heat for these games are 60 C to 87 C I already have new thermal paste.      
Dell E6440 laptop parts upgrade