HardBoiled

I mean, it depends on what you're doing. The CPU is more powerful than the graphics card when it comes to gaming. You could probably get more raw gaming performance by getting a 3600x and a 2070 super. That being said, you won't have a bad experience at all with a 3700x and a 2060 super, and if you're planning on streaming or doing any CPU-heavy work, the extra CPU horsepower will help.

The 3300X very nearly matches or even beats the 1600 in multithreaded workloads and stomps it in singlethread. A much better investment.

If you're mostly just gaming, you should probably get a 3300X instead of a 1600. It's a similar price, two fewer cores, but much higher single-thread performance. That will probably lead to a better experience overall.

Steam games are usually compressed over download. The 15gb number reflects how much disk space it will take. It will probably be a significantly smaller download, but it's very difficult to guess how much. On average, Steam compresses somewhere around 30%. No guarantees, but expect an approximately 10GB download. Take that with a grain of salt. Could be way more, could be way less - unfortunately there's no way to perfectly predict it.

I don't think a bottleneck would introduce artifacting. Is either part overclocked or damaged? They could be unstable, but a botleneck would not cause artifacting.

I have a B365M Pro4 board from ASRock that I'm running an i5 9500F in. I saw that ASRock released a BFB BIOS update that allows it to change the TDP of a chip by overclocking the base clock of the chip. I updated BIOS and changed the power target to 125W. I noticed that when I'm running F@H, it turbos up to 3.89 GHz all cores, which is what it did before enabling BFB. Shouldn't the processor be turboing up to higher clock speeds under load? If not, what am I misunderstanding about how this works?

My build has had only one case fan at the back since I got it in September, and since I've been folding non-stop for about a month, my GPU (1660 Ti) has been getting into the low 70 degrees and, more importantly, is quite loud. I'm thinking of putting in another fan or two, and I'm pretty sure I'm gonna stick with Noctua, partially because I like the fans but also because I want to be able to reuse the fan if I decide to custom watercool my next build. Bearing in mind future upgradability, should I go for a 120mm fan or a 140mm fan? Or something else? I think I want to go for 120mm, but I'm honestly not sure of the benefits of each.