This takes me back to my pc days. However I got bitten by the apple bug many moons ago so all appled up now, however i did upgrade the ram to 12gb, about the most tinkering you can do without removing the screen and even then u don't have much to mod
Sill have my old PC bit of a dinosaur by today's standards, upgraded ram and graphics a few years back for flight sim x and ran like a dream, now its a backup server for Lightroom when editing on my mac
U have a nice rig, hope u don't get any leaks