I built this a little over a year ago in anticipation of SWTOR (and haven't opened it since, obviously). I only use it for SWTOR, WoW and Minecraft. I don't think those are heavy but I really don't know anything about this stuff. I'm sure it shows in my build and my cable management =P
That said, this machine has been great for me. It's super quiet and gets a lot of hours between me and my two boys and I've never had any issues at all. I don't know temps or fps but it doesn't get loud (and hasn't failed), so I hope it's running cool enough. It plays my games very smooth at the highest settings but again, I don't think my games are very demanding.
Thanks for everybody for sharing!