You have now entered the geek zone. Personally, I have the Kryonaut Liquid Metal tim on my cpu and gpu heat spreaders and hands down it's the best of several tim's that I've tried. Even the 1g tube has done many applications and still have a lot left. You only need to spread a tiny drop of this stuff so be careful. Also, I delided my cpu and used Kryonaut it to replace the factory tim underneath the heat spreader.
If you choose to use this stuff be sure the contact surface of the heatsink isn't aluminum.
This is what I used.
https://www.amazon.com/dp/B078J4PSHM/
Yes, prepare yourself for some really geeky paragraphs. This took me about an hour to write so please read it all.
I wouldn't recommend a conductive thermal paste so someone not experienced with PC building and such, but I admit there is a LOT to be gained if you do use it. I still recommend Thermal Grizzly Kryonaut.
It has only one fan blowing in. Can I add another one for the opposite side that pulls the air out?
Yes you can. The product page advertises that it supports a dual fan configuration. I found on this thread that the Hyper 212 should come with and extra set of clips in the box to attach to a 120mm fan to connect it to the heatsink. If you lost the box, or didn't buy it in the box, you can try cable ties. Ideally you'd want a fan that matches the airflow of the other one, but I can't find the specifications for that heatsink, so I'd say you'd be fine with any regular 120mm case fan. Just try to have the more powerful fan sucking air from the heatsink and the weaker blowing air into the heatsink.
Otherwise you can buy a nicer Noctua heatsink (for about $100). I run a Noctua NH-D15, but that's only because it's a limited Linus Tech Tips edition. What I would recommend getting is the NH-U12A. It has a much newer fan design that is quieter, more efficient, and it is lower profile. Noctua is, in my opinion, the best brand for air coolers you can get, they even out perform many liquid coolers.
I wouldn't fuss too much over how you spread the thermal paste, it doesn't actually make much of a difference (excluding conductive thermal paste). Ideally you'd want it to spread over the entire metal surface of the CPU while being as thin as possible and free from air pockets. The rice grain method works just fine for this; put a rice sized blob in the center of the metal surface of the CPU. Your heatsink screws have springs on them so you don't have to worry too much about torquing them too much either, enough to keep it solid without completely depressing the springs.
A couple more things things:
Those ATX Power Connector cables shouldn't be that close the the heatsink.
It looks like your case passes air front to back, so you want your heatsink fan to match that, to work with the case fans to pass air through the heatsink. You should be able to rotate your cooler 45° like this:
If you have any questions, I will do my best to answer them.
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