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I have a thermaltake versa h18 case with two 120mm fractal fans in the front as intake and two CM master fans at the back and top for exhaust.
Its the 2600 but i dont think the 7nm 3600 would be hotter than this. It does a pretty good job. The stock cooler goes to about 75 so this brings it down a lot on load. I can test any particular application as well if you would like like 3D Mark or PC Mark.
The Ryzen 3000 series does run a bit hotter than previous chips from what I can tell after reading various posts to do with heat, voltage and boosting. My i7 6850k (14nm 140W) ran cooler than this chip, and Broadwell-E isn't exactly known for it's low temps.
I am using a Nocuta NH-D15S with my 3600, it never dropped from max boost clock at any load and stay below 60c even in stress tests.
May be a bit overkill?
I'm definitely thinking about buying a new cooler now. I'll be sticking with an air cooler though. I was looking at various Noctua models and the Dark Rock series from Be Quiet! The Scythe Mugen 5 looks like quite a substantial cooler for the price too. Basically I want an air cooler that will do a better job than the Alpenfohn Matterhorn Pure without costing more than say £80 or so. It's the first time the Matterhorn has let me down as I've used them with the i7 4790K, i7 6850K and a Xeon E5 1660v2... It never broke a sweat keeping these chips under control and that's with a low'ish fan speed tooo (around 1000rpm compared to 1500rpm with my Ryzen).
My Intel chips never went crazy hitting max boosts and voltages when just opening the browser or a new window either. I wouldn't be surprised if my Ryzen is hitting [email protected]+ just typing this.... .