lol regardless of what you think is flat with your naked eye, the IHS on all intel CPU's arent flat, they are designed with a concave center so that the retail heatsink makes specific contact with that area. Part of the reason the retail heatsinks are designed the way they are.
Now i know TR bases on all their heatsinks generally have poor maching but im just saying you can make a direct judgement of contact by thermal paste alone. I learned that the hard way.
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