AMD Ryzen 9 3900X vs Intel Core i9-11900

Compare AMD Ryzen 9 Desktop 12 core CPU vs Intel 11th Generation Core i9 8 core processor, specs and benchmark score. Which is the better CPU for gaming?

CPU Comparison

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The cheapest price from our partner retailers

$ 533
$ 352
$ 181.74 significantly less expensive

Benchmark Score

Overall Score

A combined score of all workloads

101 %
112 %
10% slightly better overall score

Gaming Score

The raw gaming performance with a fast GPU

99 %
102 %
3% slightly better gaming score

Multitasking Score

Performance in workloads using up to 8 cores

101 %
116 %
14% slightly better multitasking score

Heavy Workload Score

Performance in workloads using up to 16 cores

101 %
118 %
16% slightly better heavy workload score

Free CPU Benchmark

Want to compare your processor against the Ryzen 9 3900X and the Core i9-11900? Download our free and quick PC Performance Test.

Other Benchmarks

Geekbench (multi) score

Multi threaded benchmark

28% slightly higher Geekbench (multi) score

Geekbench (single) score

Single threaded benchmark

30% slightly higher Geekbench (single) score

3DMark Physics score

Physics simulation benchmark

0% slightly higher 3DMark Physics score



Number of physical processing units

49% significantly more cores


Number of logical processing units

49% significantly more threads

Clock Speed

Base frequency at which the chip operates

4 GHz
52% significantly higher clock speed
3 GHz

Turbo Speed

Higher frequency used for heavy workloads

5 GHz
5 GHz
13% slightly higher turbo speed


Thermal Design Power: Measure of heat generated by the CPU

105 W
65 W
61% significantly lower TDP

Memory Channels

Lanes for simultaneous memory access


L1 Cache

Smallest embedded memory, but the fastest

768 KiB
49% significantly more L1 cache
512 KiB

L2 Cache

Secondary embedded memory, slower than L1 cache

6 MiB
49% significantly more L2 cache
4 MiB

L3 Cache

General memory pool for all cores

64 MiB
300% significantly more L3 cache
16 MiB

Other details


Ranking in the hardwareDB database

48th of 1,326
25th of 1,326


The product line

Ryzen 9 Desktop
11th Generation Core i9

Release date

The official date of release of this chip

July 2019
February 2021

Memory Type

The type of memory used by this chip


Is Unlocked

Can this CPU can be overclocked


Supports ECC memory

Does this CPU support error correcting memory


Ryzen 9 3900X vs Core i9-11900 comparison

In our benchmarks, the Core i9-11900 beats the Ryzen 9 3900X in overall performance. Furthermore, our gaming benchmark shows that it also outperforms the Ryzen 9 3900X in all gaming tests too.

When comparing core counts for these CPUs, we notice that Ryzen 9 3900X has significantly more cores with 12 compared to the Core i9-11900 that has 8. It also has more threads than the Core i9-11900.

Our database shows that the Ryzen 9 3900X has a significantly higher clock speed than the Core i9-11900. Despite this, the Core i9-11900 has a slightly higher turbo speed.

The Core i9-11900 outputs less heat than Ryzen 9 3900X thanks to a significantly lower TDP. This measures the amount of heat they output and can be used to estimate power consumption.

In terms of cache, the Ryzen 9 3900X has significantly more L2 cache when compared to the Core i9-11900. The Ryzen 9 3900X also has significantly more L3 cache.

In conclusion, all specs and CPU benchmarks considered, will recommend the Core i9-11900 over the Ryzen 9 3900X.

CPU comparison

Use the table to the left to compare both the Ryzen 9 3900X and the Core i9-11900, the advantages and disadvantages of each are shown.

CPU rating

Our CPU rating is split into 4 categories: Overall, Gaming, Multitasking and Heavy Workloads. The overall score accesses performance using all CPU cores, gaming prioritises the first six cores, multitasking takes the first eight cores into account and finally heavy workloads are measured using a sixteen-core baseline.

Processor specifications

The more cores a CPU has, the better the overall performance will be in parallel workloads such as multitasking. Many CPUs have more threads than cores, this means that each physical core is split into multiple logical cores, making them more efficient. Indeed, the Ryzen 9 3900X has more threads than cores. Each physical core is split into multiple threads.

Clock speed and Turbo speed are important when comparing per core performance, generally the higher, the better. A higher clock speed may cause a higher TDP, however.

TDP (Thermal Design Power) is a measurement of how much energy is lost as heat when a processor is running. This has an impact on system temperatures. If temperatures get too high (typically around 100 °C or 200 °F), the CPU will lower its performance in order to prevent damage to the chip. Adequate cooling is essential for good performance.

Cache is very fast memory built into the processor. It stores what the CPU is currently working on and anything that doesn't fit is sent to the main system memory, which is slower but more plentiful. It is split into three levels, with Level 1 being the fastest and Level 3 being the slowest. More CPU cache is desirable for high-performance scenarios.


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