Well I have a Noctua NH-U12S SE-AM4 which is a single fan cooler. See the attached thermal system behaviour under 100% CPU load. I have not been able to reach the CPU limit yet were it automatically downclocks if it gets too hot. The worst temperature was about 80°C as a short peak and pretty stable 77°C under maximum system load with the graphic card up to 80°C as well and the room temperature around 30°C in the summer. But I think I have a very good big open case (Cooler Master CM690III) concerned system cooling which might be a reason why it can still remain quite silent and cool.

Running a Ryzen 7 1700X at stock-speed as can be seen.

Concerning the mainboard I am pretty happy with the ASUS Prime X370-Pro (mainly Intel NIC, latest Realtek HD audio, additional USB 3.1 chipset). The RAM is a problem though, my choice for the 2x8 GB Corsair Vengeance LPX (CMK16GX4M2B3200C16) was not so well if I see other people with other RAM. They only run at 2933 MHz instead of their specified 3200 MHz. At least since the last BIOS update they run at a more aggressive timing of 14-16-16-34 which is overall OK. I still hope it can get better with more BIOS updates, aiming for 3200 MHz at the former timings.

edited out.

I'm using HAF XM case from Cooler Master which is very open (I just replaced back PCI slots stubs with solid ones), and I found Demciflex filters extremely useful for keeping dust out of it, as long as you set up fans to make positive pressure inside the case.

See:
* http://www.demcifilter.com
* http://www.demcifilter.com/cu1/Optimizing-Performance.aspx

I would say noctua nhd 15 or higher will do good for that cause those temps are what I get at 4.8ghz oc on my 1800x at full load with an corsair h80i v2 with 2 fans at full load and its hot here in toronto, 30c almost today and some days hitting 40c outside. and I use an antec p100 sealed off cause dust is killer in my apartment.

please get a better cooler, I will post here some that are solid for that cpu and better for life span in the long run.

https://www.newegg.com/Product/Product.aspx?Item=N82E16835608045

https://www.newegg.com/Product/Product.aspx?item=N82E16835103099

https://www.newegg.com/Product/Product.aspx?Item=N82E16835181102

These are pretty good and anything noctua with 2 fans is pretty solid for cooling that cpu right, and note these coolers are MASSIVE so be ready for your ram slots to be half covered or all of them covered haha.

It says there "minimum = 52°C". That's the idle CPU temperature in your setup?

Yes, something between 48 to 53°C in idle. I could probably get it deeper by manually altering the fan control curve in BIOS, but what for ... no problems with heat so far.

Ah, that's somewhat high to my taste. I'll probably go with double fan then. I just wonder how noisy it would be.

Here is Noctua model for AM4: https://www.newegg.com/Product/Product.aspx?Item=9SIAADY5BC1607

Talking of ram, holy crap!

Threadripper will support up to 1tb of ram.

I'm using a Ryzen 7 1700 with the Stock cooler and under full load its whisper quite. And with the red ring looks real cool.

What's your motherboard mechmouse? I was thinking to get either Ryzen 5 1600 or Ryzen 7 1700 but i couldn't find any B350 motherboard i like and gettiing X370 seems expensive since i don't plan to overclock. I guess i'll wait some more time for the new build.

I wish they had a version of that cooler for the 1800x that can support the temps. kind of jelly tbh

They were going to do Wraith Max coolers for the 1700x and 1800x which would be even better than the Spire, but now it seems they'll only be available for pre builts. Twice the LED rings, double the cooling...

I do have to admit that I was not exactly a fan of the idea of LEDs before my build but I can now see the appeal. The night I built it I left the side panel off and had the case on my desk rather than under it and the effect was really rather nice, the MB, graphics and cooler all synced up automatically and the default red was appropriate as well. Almost enough to make me wish I'd got a glass panel case instead of a solid one. After using a stock Intel cooler which sounded like a jet taking off for a decade the Spire is also amazingly quiet, absolute night and day in comparison.

Your input made me investigate the issue a bit, et voilà, temperatures were read wrong (obviously still with the +20 K offset that was reported in monitoring software in the beginning with Ryzen). So after kicking all AMD drivers with the official AMD driver cleaner uninstall and then doing a clean reinstall of all drivers, temperatures all over the different sensors report a lot lower temps. See attachment.

I wondered especially because compared to my old rig, where you could not touch the cooler when sensors report something above 70°C, I could very well touch the Ryzen cooler while it reported more than 70°C. Also the stock/bundled cooler for Ryzen also only has a single fan and a smaller metal block then my Noctua NH-U12S SE-AM4 while it is still sufficient. As i said a good single fan cooler IS very well able to handle AMD Ryzen 7! Anything above this is only needed for Intel's latest CPU's or overclocking. ;-)

Gigabyte itx board headsup.

https://www.reddit.com/r/Amd/comments/6muoag/think_twice_before_buying_the_gigabyte_ab350_itx/

Threadripper pricing.
https://www.youtube.com/watch?v=J3pJ_--nf5E