Do I need to apply additional coolpaste on my 3700X Ryzen 7 with stock cooler?
Additional? No. It would probably worsen temperatures. There is thermal pre-applied on the cooler, so just mount it with that.
But from my personal experience the pre-applied paste isn't the best.
If you want to use another paste, you have to clean the pre-applied one with some isopropyl alcohol and something that doesn't leave fibers (coffee filters are good).
Funny thing is--I'm using the stock paste for my 3900X and I'm getting the same temps the guys who advised me not to use the stock paste get with their aftermarket paste...;) I never have seen the high temps those guys said they got before they did away with the stock paste to apply their own. Take it for what it's worth...;)
I do not know the specs of the stock thermal paste thats on there so i would just use it unless you have temperature problems.
It might be that the past has a low thermal conductivity v.s. good aftermarket paste those people use but that you get the same temps because the airflow trough your case is slightly better.
I use arctic mx-4 which has proven itself time after time again as resilient and durable
I keep a large tube in my tool box when I need to redo a rig
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