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Estimated Price:
$339.99 -20%
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Gaming Performance Comparison

Recommended System Requirements
Game Ryzen 9 3900 12-Core 3.1GHz Ryzen 7 3800X 8-Core 3.9GHz
Cyberpunk 2077 68% 64%
Assassins Creed: Valhalla 57% 52%
Call of Duty: Black Ops Cold War 69% 65%
Microsoft Flight Simulator 64% 59%
Immortals: Fenyx Rising 66% 61%
FIFA 21 70% 66%
World of Warcraft: Shadowlands 51% 44%
Watch Dogs Legion 57% 52%
Genshin Impact 76% 73%
Grand Theft Auto VI 48% 41%

In terms of overall gaming performance, the AMD Ryzen 9 3900 12-Core 3.1GHz is massively better than the AMD Ryzen 7 3800X 8-Core 3.9GHz when it comes to running the latest games. This also means it will be less likely to bottleneck more powerful GPUs, allowing them to achieve more of their gaming performance potential.

The Ryzen 9 3900 was released less than a year after the Ryzen 7 3800X, and so they are likely to have similar levels of support, and similarly optimized performance when running the latest games.

Both CPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings (assuming they are accompanied by equivalently powerful GPUs).

The Ryzen 9 3900 has 4 more cores than the Ryzen 7 3800X. 12 cores is probably excessive if you mean to just run the latest games, as games are not yet able to harness this many cores. The cores in the Ryzen 7 3800X is more than enough for gaming purposes. However, if you intend on running a server with the Ryzen 9 3900, it would seem to be a decent choice.

The Ryzen 9 3900 has 8 more threads than the Ryzen 7 3800X. Both the Ryzen 9 3900 and the Ryzen 7 3800X use hyperthreading. The Ryzen 9 3900 has 2 logical threads per physical core and the Ryzen 7 3800X has 2.

Multiple threads are useful for improving the performance of multi-threaded applications. Additional cores and their accompanying thread will always be beneficial for multi-threaded applications. Hyperthreading will be beneficial for applications optimized for it, but it may slow others down. For games, the number of threads is largely irrelevant, as long as you have at least 2 cores (preferably 4), and hyperthreading can sometimes even hit performance.

More important for gaming than the number of cores and threads is the clock rate. Problematically, unless the two CPUs are from the same family, this can only serve as a general guide and nothing like an exact comparison, because the clock cycles per instruction (CPI) will vary so much.

The Ryzen 9 3900 and the Ryzen 7 3800X are from the same family of CPUs, and thus their clock speeds are directly comparable. With this in mind, it is safe to say that with a 0.8 GHz faster base clock rate, the Ryzen 7 3800X manages to provide significantly better performance than the Ryzen 9 3900. What is more, the Ryzen 7 3800X also manages to eke 0.2 GHz higher frequency when being stressed by CPU-intensive applications.

Aside from the clock rate, the next-most important CPU features for PC game performance are L2 and L3 cache size. Faster than RAM, the more cache available, the more data that can be stored for lightning-fast retrieval. L1 Cache is not usually an issue anymore for gaming, with most high-end CPUs eking out about the same L1 performance, and L2 is more important than L3 - but L3 is still important if you want to reach the highest levels of performance. Bear in mind that although it is better to have a larger cache, the larger it is, the higher the latency, so a balance has to be struck.

The Ryzen 9 3900 has a 2048 KB bigger L2 cache than the Ryzen 7 3800X, which means that it, at worst, wins out in this area, and at best, will provide superior gaming performance and will work much better with high-end graphics cards.

The maximum Thermal Design Power is the power in Watts that the CPU will consume in the worst case scenario. The lithography is the semiconductor manufacturing technology being used to create the CPU - the smaller this is, the more transistors that can be fit into the CPU, and the closer the connections. For both the lithography and the TDP, it is the lower the better, because a lower number means a lower amount of power is necessary to run the CPU, and consequently a lower amount of heat is produced.

The Ryzen 9 3900 has a 40 Watt lower Maximum TDP than the Ryzen 7 3800X (though they were created with the same size 7 nm manufacturing technology). What this means is the Ryzen 9 3900 will consume significantly less power and consequently produce less heat, enabling more prolonged computational tasks with fewer adverse effects. This will lower your yearly electricity bill significantly, as well as prevent you from having to invest in extra cooling mechanisms (unless you overclock).

The Ryzen 9 3900 has an on-board GPU, which means that it will be capable of running basic graphics applications (i.e., games) without the need for a dedicated graphics card. The Ryzen 7 3800X, however, does not, and you will probably have to look for a dedicated card if you wish to use it at all.

For in-depth GPU comparisons with the Radeon RX Vega 11, click on the following GPU overview comparison icon (visible throughout Game-Debate), and choose a GPU from the list to compare against:

On-board GPUs tend to be fairly awful in comparison to dedicated cards from the likes of AMD or Nvidia, but as they are built into the CPU, they also tend to be cheaper and require far less power to run (this makes them a good choice for laptops). We would recommend a dedicated card for running the latest games, but integrated GPUs are improving all the time and casual gamers may find less recent games perform perfectly acceptably.

CPU Core Details

CPU CodenameZen 2Zen 2
MoBo SocketSocket AM4Socket AM4
Notebook CPUnono
Release Date07 Oct 201907 Jul 2019
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores12vs8
CPU Threads24vs16
Clock Speed3.1 GHzvs3.9 GHz
Turbo Frequency4.3 GHzvs4.5 GHz
Max TDP65 Wvs105 W
Lithography7 nmvs7 nm
Bit Width64 Bitvs64 Bit
Max Temperature95°Cvs-
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size768 KBvs512 KB
L2 Cache Size6144 KBvs4096 KB
L3 Cache Size64 MBvs32 MB
Max Memory Size-vs64 GB
Memory Channels-vs4
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsRadeon RX Vega 11
Base GPU Frequency1063 MHzvs-
Max GPU Frequency1190 MHzvs-
DirectX12vs-
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size-vs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewThe Ryzen 9 3900 is a top-end CPU based on AMD's 7nm Zen 2 microarchitecture. It offers 12 physical cores (24 logical), initially clocked at 3.1GHz, which may go up to 4.3GHz using Precision Boost. It has 64MB of L3 Cache. Level 3 cache is a static memory bank of a processor and it is used to feed it instructions. This processor also supports DDR4 based RAMs with maximum memory support of 64GB. It has a maximum Thermal Power Design of 65W. This makes the Ryzen 9 3900 a relatively power-hungry CPU, although this is in-line with the high core count. Among its many features are Simultaneous Multithreading, Cool n Quiet, CoolCore Technology, Extended Frequency Range (XFR), Pure Power and Precision Boost are enabled. It features an integrated AMD Radeon Vega GPU with 11 Compute Units that offers low-end graphical performance.The Ryzen 7 3800X 8-Core 3.9GHz is a high-end CPU based on AMD's 7nm Zen 2 microarchitecture. It offers 8 physical cores (16 logical), initially clocked at 3.9GHz, which may go up to 4.5GHz using Precision Boost. It has an unlocked multiplier, therefore, it can be overclocked using traditional methods. As an AMD 'X' CPU, the Ryzen 5 3800X can use eXtended Frequency Range (XFR) for automated overclocking. It has 32MB of L3 Cache. Level 3 cache is a static memory bank of a processor and it is used to feed it instructions. This processor also supports DDR4 based RAMs with maximum memory support of 64GB. It has a maximum Thermal Power Design of 105W. It is power efficient compared to competitor processors. Among its many features are Simultaneous Multithreading, Cool n Quiet, CoolCore Technology, Extended Frequency Range (XFR), Pure Power and Precision Boost are enabled.