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CPU Core Details

CPU Codename Zen 2 Coffee Lake
MoBo Socket Socket AM4 LGA 1151
Notebook CPU no no
Release Date 07 Jul 2019 30 Oct 2018
CPU Link GD Link GD Link
Approved

CPU Technical Specifications

CPU Cores 8 8
CPU Threads 16 16
Clock Speed 3.9 GHz 3.6 GHz
Turbo Frequency 4.5GHz 5 GHz
Max TDP 105 W 95 W
Lithography 7 nm 14 nm
Bit Width 64 Bit 64 Bit
Virtualization Technology no no

CPU Cache and Memory

L1 Cache Size 512 KB 512 KB
L2 Cache Size 4096 KB 2048 KB
L3 Cache Size 32 MB 16 MB
Memory Types
Max Memory Size 64 GB 64 GB
Memory Channels 4 2
ECC Memory Support no no

CPU Graphics

Integrated Graphics no no
Base GPU Frequency - -
Max GPU Frequency - -
DirectX - -
Displays Supported - -

CPU Mini Review

Mini Review 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. The Core i9-9900K 8-Core 3.6GHz is a top-end CPU based on a refinement of the 14nm++ Coffee Lake microarchitecture. It offers 8 physical cores (16 logical), initially clocked at 3.6GHz, which may go up to 4.7GHz using 8 cores with Turbo Boost, or up to 5.0GHz boost clock on a single or dual core. The i9-9900K has 16MB of L3 Cache. Among its many features, HyperThreading, Turbo Boost 2.0 and Virtualization are activated and the processor has its multiplier unlocked. This Core i9-9900K CPU offers the fastest gaming performance of any Intel CPU as of 2018, and will not be the bottleneck in any modern gaming PC. It will be able to play all modern games comfortably on ultra graphics performance at any supported resolution without being a hindrance to the accompanying GPU.

Gaming Performance Comparison

In terms of overall gaming performance, the AMD Ryzen 7 3800X 8-Core 3.9GHz is massively better than the Intel Core i9-9900K 8-Core 3.6GHz 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.

Both the Ryzen 7 3800X 8-Core 3.9GHz and the Core i9-9900K 8-Core 3.6GHz were released at the same time, so are likely to be quite similar.

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 7 3800X and the Core i9-9900K 8-Core both have 8 cores. Games are not yet able to harness this many cores, so it is probably excessive if you mean to just run the latest games; however, if you intend on running a server with this CPU, it would seem to be a decent choice.

Both the AMD Ryzen 7 3800X 8-Core 3.9GHz and the Intel Core i9-9900K 8-Core 3.6GHz have the same number of threads. Both the Ryzen 7 3800X and the Core i9-9900K 8-Core use hyperthreading. The Ryzen 7 3800X has 2 logical threads per physical core and the Core i9-9900K 8-Core 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 7 3800X and Core i9-9900K 8-Core are not from the same family of CPUs, so their clock speeds are by no means directly comparable. Bear in mind, then, that while the Ryzen 7 3800X has a 0.3 GHz faster frequency, this is not always an indicator that it will be superior in performance, despite frequency being crucial when trying to avoid GPU bottlenecking. As such, we need to look elsewhere for more reliable comparisons.

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 <span class='gpu1Mention'>Ryzen 7 3800X</span> has a 2048 KB bigger L2 cache than the <span class='gpu2Mention'>Core i9-9900K 8-Core</span>, 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.