The first thing I did as soon as I got the 3900X was to enter the BIOS and disable the processor boost. Immediately after, I set the processor voltage to 1.088v. I changed the multiplier to 40. I set the vsoc to 1.024. I set the VDDP and VDDG to 900, up from the previous 700. I set the FCLK to 1600 and the memory to 3200 with 1.36 voltage. I locked the BCLK at 100.

With these settings, the processor permanently runs at 4GHz and doesn't exceed 49 degrees under full load with 24 threads, and 44 degrees as a 12-core processor. It is incredibly efficient and cool. As for the cooler, keep the stock one and you'll be at most 10 degrees higher. I have an Assassin 3 at 400 RPM.

In automatic settings, motherboards provide unreasonable voltages. I have seen up to 1.5v, which is crazy. You can overclock it even further. I gave it 1.1724v for 4.2GHz.

Instead of telling you how good the processor is, I preferred to give you an example of how to safely improve its performance through the BIOS, getting rid of high temperatures. It's better to have 12 cores at 4.2GHz than 2 at 4.6GHz and the other 10 struggling with excessive voltages

All of you who are considering buying this processor, think if you really need it. It's overkill for 99% of users, especially if we're talking about gaming...

Now, about the processor.
In general, it's a beast and it doesn't lag anywhere. If you really need something like this, it's the best value for money.
I won't go into technical details, they are everywhere on the internet. But I will share my experience, the problems I encountered, and how they are solved (almost).

Since I bought it in winter and I don't plan on overclocking, I initially kept the stock cooler. It was like having an F16 inside the house. After a lot of searching, I realized that the cooler was running at 100% all the time and even in idle state, the temperatures wouldn't go below 40 with fluctuations up to 50.
I found solutions like under-voltage, etc., either through the BIOS or with Ryzen Master which really does a great job, but because I don't like to mess with factory settings, I left them stock again.
The obvious solution was to buy a liquid cooler, but after research, I saw that no one with any system managed to bring down the idle temperatures below 40, maybe 35 at best.
So the best solution I found to reduce the noise of the cooler since my temperatures would be permanently at 40+ was to enter the BIOS and change the fan settings of the cooler. It's relatively simple and the results are excellent.
The fan works at 20% until it reaches 50 degrees, and once it goes past 50, it works at 60%, while once it goes past 70, it works at 100%.
Surprisingly, the idle temperatures remained the same and at the same time, I don't have a noise problem.
In full stretch (rendering, etc.), it usually plays at around 70-75.
Cinebench R23 multi-core score: 18000 with stock settings.

- I was waiting for the 5000 series to buy the 5900X until I saw the prices..
So I bought the 3900X without a second thought.
For 400 euros, it's super if you work with multi-threaded applications. (rendering, compiling, virtualization, etc.)
For games and applications that rely on single thread performance, it's worth buying Zen 3.

- Look for "negative voltage offset" and thermal throttle limit. AMD provides more power than necessary and even with NH-U14S it reaches 85C*** in blender (room temperature 18C)
So in the summer it will reach 95C. (This is with a high airflow case.)
So I set a voltage offset of -100mV* and because it often works at 100% for days, I set the thermal throttle to 77C to keep my mind at ease (usually it goes up to 74-75).
For overclocking** without liquid cooling, forget it. Unless you live in an igloo. Then buy a life jacket because it will melt soon. (142W stock at full load) Of course, seeing what the 11900K/10900K pulls (200W+), then 140W is not much..

- Don't rely on the cooler that comes with it. Beautiful, capable, but the neighbors from the adjacent apartment complained about the noise and the army came to see if I was hiding an airplane in my house. In the end, they confiscated my vacuum cleaner. They had no idea..

- Motherboard, be very careful! Make sure the VRMs can handle it. I have an x570 MSI MPG Gaming plus and they reach 78C without overclocking. I had to undervolt, lower the VRM switching frequency to 400kHz, and increase the fan speed to keep them at 70C in the winter with 18C ambient temperature! In the summer, it is expected to be 80C+.
If you don't want to bother, buy the MSI B550 tomahawk to keep your mind at ease.

- As for the processor speed, I ran an experiment to test the frequencies it can maintain under full load (stock with undervolt), with Single N cores enabled:
(Blender rendering / AVX 256)
---------------------------------
N=1: 4.51 Ghz / 4.48 Ghz
N=2: 4.47 Ghz / 4.33 Ghz
N=3: 4.42 Ghz / 4.28 Ghz
N=4: 4.30 Ghz / 4.22 Ghz
N=5: 4.28 Ghz / 4.20 Ghz
N=6: 4.23 Ghz / 4.17 Ghz
N=7: 4.17 Ghz / 4.10 Ghz
N=8: 4.17 Ghz / 4.09 Ghz
N=9: 4.10 Ghz / 4.04 Ghz
N=10: 4.07 Ghz / 4.01 Ghz
N=11: 4.06 Ghz / 4.00 Ghz
N=12: 4.05 Ghz / 3.96 Ghz

Conclusions:
- Up to 3 active cores (1 ccx), you have the best single core performance.
- Up to 6 (the good ccd), relatively good balance between clock and multicore performance.
- From 6+ (good ccd + bad ccd), the single core performance decreases.
- The processor has one good ccd and one bad ccd, each containing 2 ccx with 3 cores each.
If you're lucky, you may get a 3900X with two good ccds and it may be able to maintain higher frequencies with less power. (about 6% chance according to siliconlottery.com)

* The amount you can lower it depends on the CPU.
Basically, the process is as follows:
Run a benchmark (e.g. cinebench R23) three times to find the score. Lower the offset a bit in the BIOS, e.g. from -0.05V to -0.625V, and repeat until you see a worse score. Once you find this change, go back to the previous setting (personally, I went back two settings for stability). You will gain some performance and reduce the temperature. Win-win.

** In my opinion, there's no need to bother with overclocking. Lower the voltage a bit, use a good cooler, 3600 cl16 RAM, and it will give you 96% on its own.

*** 85C is too much for stock, in the second photo you can see how I set up the cooling.

After 20 years with Intel, I also decided to give it a try. So far, it seems to be very powerful and performs well in demanding multithread applications. I noticed a real difference in how it works with 3D design software. I can't be objective about gaming since I haven't upgraded my GPU to an RTX yet, so it doesn't perform at its maximum and I always play at 1080p resolution. With liquid cooling (H115i Platinum), temperatures range from 44 to 67 degrees with a good thermal paste (which is generally recommended) and in balance profile, in extreme mode, the maximum temperature drops by 4 degrees. It does have some sudden jumps in performance (one of the few areas where it lags behind Intel) if you have a monitoring tool.

Configuration:
Asus Rog Strix X570-E Gaming
Corsair H115i Platinum
G.Skill TridentZ 16GB DDR4-3200MHz
970 Evo Pro M.2

For the money, I think there is no competition (purchased for 387). If you want maximum gaming performance and care about FPS, even for minimal differences, for me, go for the 10700K or 10900K at almost double the price.

Coming from Intel for many years, with the latest being the 9900K, I can say that the difference between them at 1440p/144hz is small, except for latency. In many titles, together with the 2080ti, it performs minimally. I paired it with the Asus B550 E-GAMING and an NVMe, and it boots into Windows 10 in 5 seconds. Now, in terms of temperatures, no matter what cooling solution you use, it stays at 41°C to 44°C idle with continuous spikes reaching 50°C to 60°C. Only with Ryzen Master does it work normally with custom voltages without constantly raising temperatures. Unfortunately, it doesn't listen to the motherboard. In multitasking, it outperforms the 10900K with much lower power consumption. That's why I switched to Intel this year and decided to experiment with Ryzen after many years. I won't give it 5 stars because perfection doesn't exist. If they manage to replicate Intel's behavior in terms of latency and reduce clock speeds without fluctuations, it will surpass Intel by far.

EDIT:
Now that we've reached late September with room temperature at 25/26°C, I can say that with a negative offset of -0.0875 and everything else on auto, except for the memory set to DOCP/XMP at 3600, it idles at 33/35°C with some normal spikes when opening something. In Cinebench R20, it scores 7380 in multi-core and 522 in single-core, with temperatures not exceeding 72/74°C. In gaming at 1440p/144hz for several hours, it stays at 55/58°C with occasional spikes up to 60/65°C in loading scenes. Keep in mind that up to -0.1 offset maintains the best performance with lower voltages. Out of the box, with the voltages provided by the motherboards, you will experience chip degradation very quickly. Anything above 1.36+ voltages will significantly reduce the chip's performance. For those who don't want to deal with motherboard settings, they can use Ryzen Master. I have a saved profile at 4.1 GHz with 1.13 voltages, which I used throughout the summer, and the temperatures are 10°C lower than the negative offset I'm currently using.

Now, whether it's worth buying now or waiting for the new Ryzen processors to come out, it would be good to wait a bit and compare the pros and cons before making a decision. I'm using a 360 liquid cooling solution, and I would say not to use the stock cooler at all.

In my personal opinion, at the moment, considering power/price, it is the best processor on the market. The price difference with the 3700x at the moment is around 135-140 euros (speaking about the same store or the first one available) and it is really worth it, as it is much better in Multi Thread tasks (the 3700x is also an excellent CPU, don't get me wrong). The Performance Core Boost works exceptionally well, especially for Single Thread applications, where it provides a significant increase. The installation is also very easy. However, make sure to download the necessary AMD software (AGESA/Ryzen Power Plans (AMD Chipset Drivers)/AMD Ryzen Master). At the same time, update the BIOS.

The cooler that comes with it (Wraith Prism) does a very good job if you are an enthusiast user with normal levels. Specifically, under idle conditions and at 25°C ambient temperature, the temperatures it maintains are around 40-43 degrees. Now let's see some results from stress tests (Cinebench R20):

Core Performance Boost OFF: ST ~445, MT ~6800, ST temps ~62°C, MT temps ~73°C
Core Performance Boost ON: ST ~515, MT ~7150/7200, ST temps ~67-70°C, MT temps ~81-84°C

In renders from 3 to 10 minutes for architectural and graphic designs (100% load), the maximum temperature was 86°C. With the case open, the maximum was 81°C.

Note that all the above are with stock settings and as the processor comes (it comes with Precision Boost 2 enabled, which is what I refer to as Core Performance Boost). I won't talk at all about PBO, AutoOC, and manual OC because these are not stock settings and the discussion is extensive (personally, I won't bother with any of them).

Cinebench R20 is a strong stress test, so in gaming (ST) or in some MT applications and tasks, don't expect to reach similar temperatures. Nevertheless, if you are a user who constantly and powerfully utilizes MT scenarios, you may need to use an aftermarket cooler (e.g. BeQuiet! Dark Rock Pro 4).

For me, the only negative aspect of the stock cooler is that it makes a bit of noise. Otherwise, with my usage so far, I am very satisfied with its performance. Also, aesthetically it is very beautiful (RGB - but let's emphasize that it is the last thing we care about).

In conclusion, at the moment, with 430 euros, you can get a globally top processor with top performance in both ST and MT scenarios, including a decent cooler. With an upgrade to better cooling, expect an additional 70 euros. There is truly no competition at this price point and with such performance.

EDIT: I "tweaked" my case a bit to maximize airflow and I am getting excellent temperatures in anything that is not 100% all-core load (they remain the same as before at their maximum value - 85°C - but the processor boosts to higher frequencies). In 1440p ultra gaming and with a room temperature of 24°C, I now have temperatures of 60-65°C after long sessions! Always go for the Wraith Cooler.

The main (not to say the only) reason to get the 3900X instead of its little brother, the 3700X, is the DOUBLE cache at 64MB instead of 32. It is also what gives it the difference in speed, especially if you are working with large files. In terms of power, considering that it has 4 additional cores and double the cache, it doesn't perform badly with 40W more than the smaller model, essentially with 10W per extra core with its cache. Of course, these are the nominal TDP values at 105W, which do not remain in case of overclocking, although Ryzen CPUs are already hot and the benefit of overclocking an expensive CPU is not worth it since OC ALWAYS "ages" the circuits (CPU/VRM/capacitors/chipset/RAM, etc.). Also, don't expect to see huge differences due to the 4/8 additional cores/threads unless you are using heavy applications that utilize them. Even the most popular programs (and many games) have not made the necessary optimization updates for 3rd generation Ryzen. In general, games prefer high frequency on one core rather than "idle" on many. So think about it before spending an extra 150 euros, in relation to what you will ACTUALLY get in everyday performance. If you constantly have multiple open programs for video editing, 50-100 tabs in the browser, 3D rendering, 4-5 virtual machines, AND play games that use the Vulkan API, which scales to as many cores as it finds, then it's worth it. In fact, it's worth more than Threadripper for SPECIFIC use cases. To get such a large cache, you would have to go for server-grade processors, mainly EPYC and XEON, which exceed a thousand euros. Therefore, anyone who wants to build a workstation PC for all tasks and doesn't care about the extra 150 euros and 40W of power, should get this one. Otherwise, you can get the 3700X, which does it all AND is cost-effective. Finally, I would like to note that generally in Greece, prices for hardware are always inflated and sometimes outrageously inflated, having seen differences of 50-100 euros in basic components for assembling a PC. And it's not always due to the lack of supply amid the pandemic.

Well, I had the i5-3470 and I changed it for the 3900X to be more future-proof.

Currently, under light load (40 open Firefox tabs), the tower (without a monitor) consumes 135 watts (with 2 hard drives, 4 SSDs, and 5 fans). Generally, from the tests I have done with 100% CPU usage, the processor alone consumes 145-150 watts without any overclocking from the BIOS. With the AGESA 1.004 BIOS update, the core clocks reach 4.625MHz.

Now, regarding games and applications: it works great with an RX 570 8GB, considering the low performance of the graphics card. It doesn't make much sense to mention FPS for this reason, as there is no exact comparison metric.

The only negative aspect is the temperatures. With the Noctua NH-D15, it stays consistently at 50+ degrees, but if you run Prime 95, it reaches 83-84+ degrees with an ambient temperature of 20-22 degrees. The motherboard (Asrock Phantom Gaming X) is supposed to be very good and has good VRMs.

It performs exceptionally well in video editing! It's a beast, and the price at 450 was an excellent opportunity.

Also, for those who get Ryzen processors, install the DRAM calculator to overclock your RAM (as much as you can without damaging them, of course). It made things easier for me because it provides all the options by simply adjusting the frequency at which you want your RAM to work.

Of course, the price is expected to drop even more, but I have no regrets about the purchase!

5/5.

Purchased a few days ago and I want to express my first impressions. Well... Excellent processor, very powerful beast!! But...!! Be very careful with temperatures. It has been installed in an MSI X470 Gaming Plus and what I have seen so far is an erratic behavior and sudden jumps of the processor, resulting in temperatures ranging from 50 to 85 degrees with the stock cooler. After a lot of reading and staying up all night, I discovered that this processor works and depends on three things simultaneously!!! Firstly, the BIOS settings (turn off game mode and PBO to see the processor reach from 3.5 MHz to 4.6 MHz for smoother operation!). Secondly, it depends on what power plan management the Windows decide to use (balanced-performance-ultimate). Depending on the plan, the processor will have different behavior. Thirdly, it depends on the drivers you will use for the chipset (AMD or the specific motherboard) as well as the installed BIOS. Overall, it is a perfect processor but it has many parameters to work at 100% and requires a lot of reading on related forums!! I hope I helped!! It is worth every penny and more!!

It is a perfect combination of price, performance, and power consumption.

I paired it with the ASUS Pro WS X570-ACE and G.Skill TridentZ Neo 64GB DDR4-3600MHz (F4-3600C16Q-64GTZN) and "be quiet dark rock pro 4".

I made a big change and experiment, I moved away from Intel and switched to this and I am thrilled. To do this, I had built 2 PCs on paper, one with Intel and one with AMD, and I ended up with AMD precisely because it is an ideal combination of price, speed, performance, and power consumption.

Everything works steadily and quickly, excessively fast even though I slightly reduced the frequency of the RAM because it was freezing, but I have had this issue with all the RAM I have tried over the years.

I have also installed an M.2 drive for the main boot disk, which reaches an incredible speed of 3500 Mb/s, when a disk barely reaches 200Mb/s.

I don't know what else to say except that from all aspects, I have a very fast and quiet system.

The cores are sufficient and I only use all of them when rendering.

The speed of a single thread for simple tasks, which is the most common, is very good at 3.80 GHz, reaching 4.20 GHz from what I can see.

It is very stable - although I had great fears about it. In fact, it is not a new setup, but almost as it was with the disk and Intel drivers, I put it on the AMD and it worked right away - not so simple, I uninstalled anything related to Intel before, I had made backups of everything, and several other details - but the essence is that I switched from Intel by making a brave update and I have not regretted it.

Used for about 3 months,

Main uses are games, 3d modeling (3dmax, sketchup), and 3d rendering (VRAY).

It is paired with x570 aorus pro, HyperX Predator 32GB 3333mhz, gtx 1070 asus dual,
cooled with thermalright le grand macho RT.

For games,
With the current pairing of the 1070, the GPU is constantly working at 100%, while the CPU is comfortable.
Temperatures during long gaming sessions average around 55 degrees Celsius, with a maximum of 65 degrees.
During long rendering sessions (100% usage of all cores), temperatures average at 72 degrees, with a maximum of 79 degrees.
Room temperature is around 20 degrees.

I recommend pairing it with good cooling (a large tower cooler or dual tower cooler do a good job, as well as AIO/water cooling, although not necessary) for better comfort, especially if it will be used for long rendering sessions, along with a case with good airflow.

Summary/ tl;dr: With the right combination, it provides a top-notch mini workstation PC (competing with older and newer server/HEDT models) with excellent gaming and desktop performance, slightly behind the more expensive Intel solutions in maximum scenarios (2080ti, overclocking) in games, and significantly superior in production/multi-core scenarios/workloads, with lower power consumption.

Personally, I do not recommend it for SOLELY gaming/simple desktop use, as there are more suitable solutions available for less money, either with a small difference in performance or by allocating the price difference towards a higher-end GPU.

Incredible processor for any kind of use and the power consumption is lower than that of the i9 9900k. However, if someone wants more fps, around 3-5, they should go with Intel.

I am a programmer and I have been working with something called distributed computing lately, so I have 3-4 virtual machines open and I run code on 4 different systems simultaneously.

The temperatures do not exceed 45 degrees, even when I am building an Android application and exporting a 10-minute video from Adobe Premiere at the same time. However, it should be noted that I have the Masterliquid 360 ML360R cooler from CoolerMaster and a 2080Ti Gaming OC, so MAYBE my review does not apply to the average builder. But if it does apply to you, don't worry, it is a very good investment.

Also, it should be noted that I have not had the opportunity to benchmark it, but I have overclocked it to 4.1 and the temperatures I mentioned are with the processor at 4.1GHz.

Update 20/11/2019
R9 4.1GHz [Multicore]: 7140 (with Cinebench R20)

It is very important for the user, before purchasing a product, to evaluate the product based on their needs. And here, definitely, with the new 3xxx series processor, we should judge whether we should proceed with its purchase. I would definitely recommend it to someone who deals with video-image processing, to a graphic designer, to people who deal with simulators, and I don't mean simulator games. The truth is that this particular computer has a significant increase in performance compared to the Intel 9900K in games, but not enough to be better. With much less money, you can buy the smaller series of Intel and have decent performance. Of course, no one will forbid you from making your own choices. Now, as for this specific processor, I believe that AMD has surpassed in performance. It easily compares to its big brothers, the 2950X, 2970X, and even surpasses them in some programs. This is both good and bad, I don't know what the reason was for AMD to follow this logic, which essentially produces a processor that competes with the larger models. In terms of temperatures, it behaves very well ALWAYS with good liquid cooling, but not with air cooling. It can be easily overclocked, but don't expect to go too high. What the company mentions is true, meaning with a little constant power, you will be at 4.3 with a little more power (1.350). The price is a bit high for Greek standards, but believe me, it's worth it!