system
A chat on subreddit /r/pcmasterrace
human
That Cpu and motherboard still has some life to it. (no matter what unless you're at the newest gen people in this community will say to get an all new system so ignore them.)

That ram needs a bump to 16gb as that's more or less the standard to this day. Your motherboard will determine the speed but if it can handle it for $40 on Amazon you can get 3200 mghz. 

The gpu is pretty dated especially if its the 2gb model. I would start to look for an upgrade but really this upgrade is extremely budget dependent.
gpt
As someone with a 6600k that cpu does not have much life left in it.  If they upgrade the gpu they will be massively bottlenecked by that cpu.