AMD EPYC 7742 vs AMD Ryzen 9 3900XT

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CPU comparison with benchmarks


AMD EPYC 7742 CPU1 vs CPU2 AMD Ryzen 9 3900XT
AMD EPYC 7742 AMD Ryzen 9 3900XT

CPU comparison

In this CPU comparison, we compare the AMD EPYC 7742 and the AMD Ryzen 9 3900XT and use benchmarks to check which processor is faster.

We compare the AMD EPYC 7742 64 core processor released in Q3/2019 with the AMD Ryzen 9 3900XT which has 12 CPU cores and was introduced in Q2/2020.
AMD EPYC (129) Family AMD Ryzen 9 (35)
AMD EPYC 7002 (24) CPU group AMD Ryzen 3000 (15)
2 Generation 3
Rome (Zen 2) Architecture Matisse (Zen 2)
Desktop / Server Segment Desktop / Server
-- Predecessor --
-- Successor --

CPU Cores and Base Frequency

The AMD EPYC 7742 is a 64 core processor with a clock frequency of 2.25 GHz (3.40 GHz). The processor can compute 128 threads at the same time. The AMD Ryzen 9 3900XT clocks with 4.10 GHz (4.70 GHz), has 12 CPU cores and can calculate 24 threads in parallel.

AMD EPYC 7742 Characteristic AMD Ryzen 9 3900XT
64 Cores 12
128 Threads 24
normal Core architecture normal
Yes Hyperthreading Yes
No Overclocking ? Yes
2.25 GHz Frequency 4.10 GHz
3.40 GHz Turbo Frequency (1 Core) 4.70 GHz
2.80 GHz Turbo Frequency (All Cores) 4.60 GHz

Artificial Intelligence and Machine Learning

Processors with the support of artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors. Algorithms for ML improve their performance the more data they have collected via software. ML tasks can be processed up to 10,000 times faster than with a classic processor.

AMD EPYC 7742 Characteristic AMD Ryzen 9 3900XT
-- AI hardware --
-- AI specifications --

Internal Graphics

Graphics (iGPU) integrated into the processor not only enable image output without having to rely on a dedicated graphics solution, but can also efficiently accelerate video playback.

no iGPU GPU no iGPU
GPU frequency --
-- GPU (Turbo) --
-- GPU Generation --
Technology
Max. displays
-- Compute units --
-- Shader --
No Hardware Raytracing No
No Frame Generation No
-- Max. GPU Memory --
-- DirectX Version --

Hardware codec support

A photo or video codec that is accelerated in hardware can greatly accelerate the working speed of a processor and extend the battery life of notebooks or smartphones when playing videos.

no iGPU GPU no iGPU
No Codec h265 / HEVC (8 bit) No
No Codec h265 / HEVC (10 bit) No
No Codec h264 No
No Codec VP9 No
No Codec VP8 No
No Codec AV1 No
No Codec AVC No
No Codec VC-1 No
No Codec JPEG No

Memory & PCIe

Up to GB of memory in a maximum of 8 memory channels is supported by the AMD EPYC 7742, while the AMD Ryzen 9 3900XT supports a maximum of 128 GB of memory with a maximum memory bandwidth of 51.2 GB/s enabled.

AMD EPYC 7742 Characteristic AMD Ryzen 9 3900XT
DDR4-3200 Memory DDR4-3200
Max. Memory 128 GB
8 (Octa Channel) Memory channels 2 (Dual Channel)
51.2 GB/s Max. Bandwidth 51.2 GB/s
Yes ECC Yes
-- L2 Cache --
256.00 MB L3 Cache 64.00 MB
4.0 PCIe version 4.0
128 PCIe lanes 20
252.0 GB/s PCIe Bandwidth 39.4 GB/s

Thermal Management

The AMD EPYC 7742 has a TDP of 225 W. The TDP of the AMD Ryzen 9 3900XT is 105 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution.

AMD EPYC 7742 Characteristic AMD Ryzen 9 3900XT
225 W TDP (PL1 / PBP) 105 W
-- TDP (PL2) 142 W
-- TDP up --
-- TDP down --
-- Tjunction max. 95 °C

Technical details

The AMD EPYC 7742 has 256.00 MB cache and is manufactured in 7 nm. The cache of AMD Ryzen 9 3900XT is at 64.00 MB. The processor is manufactured in 7 nm.

AMD EPYC 7742 Characteristic AMD Ryzen 9 3900XT
7 nm Technology 7 nm
Chiplet Chip design Chiplet
x86-64 (64 bit) Instruction set (ISA) x86-64 (64 bit)
SSE4a, SSE4.1, SSE4.2, AVX2, FMA3 ISA extensions SSE4a, SSE4.1, SSE4.2, AVX2, FMA3
SP3 Socket AM4 (PGA 1331)
AMD-V, SVM Virtualization AMD-V, SVM
Yes AES-NI Yes
Windows 10, Linux Operating systems Windows 10, Windows 11, Linux
Q3/2019 Release date Q2/2020
9000 $ Release price --
show more data show more data


Rate these processors

Here you can rate the AMD EPYC 7742 to help other visitors make their purchasing decisions. The average rating is 5.0 stars (1 ratings). Rate now:
Here you can rate the AMD Ryzen 9 3900XT to help other visitors make their purchasing decisions. The average rating is 5.0 stars (4 ratings). Rate now:


Average performance in benchmarks

⌀ Single core performance in 3 CPU benchmarks
AMD EPYC 7742 (74%)
AMD Ryzen 9 3900XT (100%)
⌀ Multi core performance in 4 CPU benchmarks
AMD EPYC 7742 (100%)
AMD Ryzen 9 3900XT (50%)

Geekbench 5, 64bit (Single-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 3.40 GHz
1050 (74%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.70 GHz
1414 (100%)

Geekbench 5, 64bit (Multi-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 2.80 GHz
37515 (100%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.60 GHz
12974 (35%)

Geekbench 6 (Single-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The single-core benchmark only evaluates the performance of the fastest CPU core, the number of CPU cores in a processor is irrelevant here.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 3.40 GHz
1278 (74%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.70 GHz
1719 (100%)

Geekbench 6 (Multi-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The multi-core benchmark evaluates the performance of all of the processor's CPU cores. Virtual thread improvements such as AMD SMT or Intel's Hyper-Threading have a positive impact on the benchmark result.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 2.80 GHz
13647 (100%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.60 GHz
10689 (78%)

Cinebench R20 (Single-Core)

Cinebench R20 is the successor of Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 3.40 GHz
398 (74%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.70 GHz
539 (100%)

Cinebench R20 (Multi-Core)

Cinebench R20 is the successor of Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 2.80 GHz
20644 (100%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.60 GHz
7244 (35%)

Estimated results for PassMark CPU Mark

Some of the CPUs listed below have been benchmarked by CPU-monkey. However the majority of CPUs have not been tested and the results have been estimated by a CPU-monkey’s secret proprietary formula. As such they do not accurately reflect the actual Passmark CPU mark values and are not endorsed by PassMark Software Pty Ltd.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 2.80 GHz
65631 (100%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.60 GHz
32790 (50%)

Cinebench 2024 (Single-Core)

The Cinebench 2024 benchmark is based on the Redshift rendering engine, which is also used in Maxon's 3D program Cinema 4D. The benchmark runs are each 10 minutes long to test whether the processor is limited by its heat generation.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 3.40 GHz
0 (0%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.70 GHz
78 (100%)

Cinebench 2024 (Multi-Core)

The Multi-Core test of the Cinebench 2024 benchmark uses all cpu cores to render using the Redshift rendering engine, which is also used in Maxons Cinema 4D. The benchmark run is 10 minutes long to test whether the processor is limited by its heat generation.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 3.40 GHz
0 (0%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.70 GHz
1074 (100%)

Cinebench R23 (Single-Core)

Cinebench R23 is the successor of Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 3.40 GHz
0 (0%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.70 GHz
1354 (100%)

Cinebench R23 (Multi-Core)

Cinebench R23 is the successor of Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 2.80 GHz
0 (0%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.60 GHz
18511 (100%)

CPU-Z Benchmark 17 (Multi-Core)

The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 2.25 GHz
0 (0%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.10 GHz
8118 (100%)

Cinebench R15 (Single-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 3.40 GHz
0 (0%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.70 GHz
219 (100%)

Cinebench R15 (Multi-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
AMD EPYC 7742 AMD EPYC 7742
64C 128T @ 2.80 GHz
0 (0%)
AMD Ryzen 9 3900XT AMD Ryzen 9 3900XT
12C 24T @ 4.60 GHz
3192 (100%)

Devices using this processor

AMD EPYC 7742 AMD Ryzen 9 3900XT
Unknown Unknown

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