AMD Ryzen 9 3900X is a capable processor, packing the same performance as the older entry-level Threadripper. A significant difference here is the 3900X is supported by non-Threadripper chipsets, allowing you to install it on consumer-grade motherboards.
If we were to make a suggestion...
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The choice of RAM is fairly easy. Go with the highest speed your processor and system will allow, choose the capacity you require, and pick a kit from a brand you trust. There are other options out there, but your choice should only come down to these three.
We continue to recommend Corsair's Vengeance LPX 16GB Kit because it works well with the Ryzen 3900X at 3200MHz. It's also just affordable. After spending so much on the high-end CPU here, you'll save some money, and who doesn't love that?
Should you want your RAM to look fancy, the G.SKILL TridentZ kits are genuinely unique with colorful designs and plenty of RGB lighting. The one listed here also clocks in at 3200MHz.
