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2) Regarding air cooling 3700X, NH-U9S should be OK. But if I were you, I prefer max cooling and thus will prefer Thermalright Silver Arrow 130. Temp will be lower and less noisy (due to a larger fan spinning lower). This, of course, is a relatively thing and it is up to your personal preference/tolerance of temp/noise.Seems you are after a black looking one (ie chromax.black). SA130 has a graphene version (a limited version). It claims to lower the temp but do not count on it for more than a couple degrees. Just go for the look, if you can find one.Lastly, if you have two 120mm bottom case fans as intake (and probably with a rear 92mm exhaust case fan), then the entire case might become pressure positive at all times (depending on the fan curves, of course). If so, then you will not need dust filter for the side panel. This will also answer your question #3.
2) Regarding air cooling 3700X, NH-U9S should be OK. But if I were you, I prefer max cooling and thus will prefer Thermalright Silver Arrow 130. Temp will be lower and less noisy (due to a larger fan spinning lower). This, of course, is a relatively thing and it is up to your personal preference/tolerance of temp/noise.
Seems you are after a black looking one (ie chromax.black). SA130 has a graphene version (a limited version). It claims to lower the temp but do not count on it for more than a couple degrees. Just go for the look, if you can find one.
Lastly, if you have two 120mm bottom case fans as intake (and probably with a rear 92mm exhaust case fan), then the entire case might become pressure positive at all times (depending on the fan curves, of course). If so, then you will not need dust filter for the side panel. This will also answer your question #3.
