EPYC 7643 vs Ryzen 9 3900X

VS

Aggregate performance score

Ryzen 9 3900X
2019
12 cores / 24 threads, 125 Watt
20.53
EPYC 7643
2021
48 cores / 96 threads, 225 Watt
47.88
+133%

EPYC 7643 outperforms Ryzen 9 3900X by a whopping 133% based on our aggregate benchmark results.

Primary details

Comparing Ryzen 9 3900X and EPYC 7643 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking27538
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation21.746.71
Market segmentDesktop processorServer
SeriesAMD Ryzen 9AMD EPYC
Power efficiency15.5420.14
Architecture codenameMatisse (Zen 2) (2019−2020)Milan (2021−2023)
Release date7 July 2019 (5 years ago)15 March 2021 (3 years ago)
Launch price (MSRP)$499$4,995

Cost-effectiveness evaluation

Performance per price, higher is better.

Ryzen 9 3900X has 224% better value for money than EPYC 7643.

Detailed specifications

Ryzen 9 3900X and EPYC 7643 basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores12 (Dodeca-Core)48 (Octatetraconta-Core)
Threads2496
Base clock speed3.8 GHz2.3 GHz
Boost clock speed4.6 GHz3.6 GHz
Multiplierno data23
L1 cache96K (per core)64 KB (per core)
L2 cache512K (per core)512 KB (per core)
L3 cache64 MB256 MB (shared)
Chip lithography7 nm, 12 nm7 nm+
Die sizeno data8x 81 mm2
Maximum core temperature95 °Cno data
Number of transistors19,200 million33,200 million
64 bit support++
Windows 11 compatibility++
Unlocked multiplier+-

Compatibility

Information on Ryzen 9 3900X and EPYC 7643 compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration1 (Uniprocessor)2
SocketAM4SP3
Power consumption (TDP)125 Watt225 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen 9 3900X and EPYC 7643. You'll probably need this information if you require some particular technology.

AES-NI++
AVX++
Precision Boost 2+no data

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen 9 3900X and EPYC 7643 are enumerated here.

AMD-V++

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen 9 3900X and EPYC 7643. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR4 Dual-channelDDR4-3200
Maximum memory size128 GB4 TiB
Max memory channels2no data
Maximum memory bandwidth51.196 GB/s204.795 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card-N/A

Peripherals

Specifications and connection of peripherals supported by Ryzen 9 3900X and EPYC 7643.

PCIe versionno data4.0
PCI Express lanesno data128

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

Ryzen 9 3900X 20.53
EPYC 7643 47.88
+133%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Ryzen 9 3900X 32614
EPYC 7643 76050
+133%

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

Ryzen 9 3900X 1710
+32.4%
EPYC 7643 1292

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

Ryzen 9 3900X 9940
EPYC 7643 12182
+22.6%

Gaming performance

Pros & cons summary


Performance score 20.53 47.88
Recency 7 July 2019 15 March 2021
Physical cores 12 48
Threads 24 96
Power consumption (TDP) 125 Watt 225 Watt

Ryzen 9 3900X has 80% lower power consumption.

EPYC 7643, on the other hand, has a 133.2% higher aggregate performance score, an age advantage of 1 year, and 300% more physical cores and 300% more threads.

The EPYC 7643 is our recommended choice as it beats the Ryzen 9 3900X in performance tests.

Note that Ryzen 9 3900X is a desktop processor while EPYC 7643 is a server/workstation one.


Should you still have questions on choice between Ryzen 9 3900X and EPYC 7643, ask them in Comments section, and we shall answer.

Vote for your favorite

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AMD Ryzen 9 3900X
Ryzen 9 3900X
AMD EPYC 7643
EPYC 7643

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Community ratings

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Questions & comments

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