Latitude E6520 upgrades

Hello,

I have a Latitude E6520 laptop that I have purely for personal use. The stock HDD decided it wasn't for this world, so I'd like to replace it with an SSD.

While I'm in there, I'd like to see if I could upgrade the CPU and RAM a bit more, as I enjoy a bit of light gaming.

It's currently got 8gbs of DDR3 RAM, and an Intel i5 2520M. I don't know enough to tell if the GPU is discrete or not, but I do know that the CPU is the only removable chip, everything else is soldered on.

What parts can I upgrade? I'm not expected like xps performance, but a bit more than it's got now would be nice.

Thanks.