FCCloud

You are totally right about the 4 fans that you have right now. Right now, I think that, if you can cover the fan slots on the top of your case, 4 fans in the setup you have right now is totally enough. However, you can add more if you wish. There are two ways you can go with adding an additional fan. You can place one fan in front of the CPU, to feed fresh air into your CPU cooler (I recommend this for the extra positive pressure in your dusty environment), or place one exhaust fan in the rearmost top slot to help with your case ventilation. Again, I'd go with the first one to make certain that as little dust can enter your case in other places as possible.

I agree with you. I personally use the Arctic Freezer 33 eSports ONE. Its successor, the Arctic Freezer 34 is actually cheaper than the 33 for marginally better performance. They'll last you a long time and are very quiet. I run a 2600 oced to 4.1, and it never gets loud under gaming use.

That is really unfortunate. I think you'll have to return both the CPU and the motherboard then. If you can buy a B450 Tomahawk MAX for around the same price and the 3600, depending on how much of a discount (you'd need a pretty hefty discount for that to happen) you got at your bundle, that would be more worth it than buying the cheapest AM4 CPU supported by your motherboard right now.

I'd like to add another possible combo, if I may. The R5 3600 is a great chip for the price, but I feel like the B450 Tomahawk MAX from MSI would save a few bucks. Unless you need an unfathomable number of SATA ports or PCIe Gen 4 for storage, I'd go with 400 series when possible. If you do go with the B450 Tomahawk MAX, make sure that it says MAX on the product listing and the photo. The non-MAX has serious BIOS issues with Ryzen 3000 right now, but the MAX boards work with Ryzen 3000 out of the box.

I saw on Reddit (r/MSI_Gaming) that trying the v18 BIOS is one route that you could take to try to possibly get Ryzen 3000 to work on non-MAX boards. Unfortunately the BIOS problems with the noted non-MAX boards still continue on MSI's 400 series motherboards. If that doesn't work, you either are going to have to wait until MSI figures out a solution, or return your motherboard and get a B450 Tomahawk MAX. This is a different thread on r/MSI_Gaming that might help you: https://www.reddit.com/r/MSI_Gaming/comments/ce3ift/msi_b450_tomahawk_update/ I understand you are in a difficult situation here. Good luck with your problem and I hope that it gets resolved soon.