Why does it matter AT ALL that he bough this processor? He has it, shut up and just answer his questions.
Do you have the stock heatsink? If so, the temps sounds a little too low.
Do you have a case with amazingly high airflow? If so, than this might give us our answer.
Ensure that you dust out the computer frequently, and I would say every month monitor the temps to ensure no drastic changes.
In regards to the 12 threads showing 100%, what program are you running? Get Intel burn test to ensure that you are REALLY stressing the processor.
Thanks Stu - I understand people's "concern" whenever the 980x is mentioned - and not just here, it's the same story everywhere. It's a thousand-dollar processor, it's bound to provoke...!
This is a Cinema 4D render pushing the cores to 100% - C4D is multi-threaded, 64-bit app and is very reliable - I'm sure you're familiar with Cinebench - C4D is the modeling app it's based on.
I added a 140mm to blow fresh air onto the GPU and did a meticulous job of routing cables - pretty proud of it actually, for my first build. I am using the stock HSF but apparently it's a good one - gets good reviews around the web. The consensus seems to be that Intel finally released a decent stock HSF.
I'm pretty diligent about dust build-up. Living in NYC there's dust and everything else in the air at all times, so I clean my screens every 2 weeks or so. My idle temps (using RealTemp) are from 17-22 and I've yet to hit 65 at full load. Either something is goofy with RealTemp (I'll prob install Speedfan at some point) or else ... or else I don't know, maybe I just did a good job!
[edit: I also have 2 USB drives with a clip-on fan blowing room air onto them, and the fan is pointed directly inline with the 200mm intake fan on the front of the HAF-X. So that's probably contributing some cooling as well inside the case.]