AMD Ryzen 9 3900XT vs Ryzen 7 5800X

We compared two desktop CPUs: the 3.8 GHz AMD Ryzen 9 3900XT with 12-cores against the 3.8 GHz Ryzen 7 5800X with 8-cores. On this page, you'll find out which processor has better performance in benchmarks, games and other useful information.


General overview and comparison of the processors
Single-Core Performance
Performance in single-threaded apps and benchmarks
Measure performance when all cores are involved
Power Efficiency
The efficiency score of electricity consumption
NanoReview Final Score
Generic CPU rating

Key Differences

What are the key differences between 5800X and 3900XT
Advantages of AMD Ryzen 9 3900XT
  • Has 32 MB larger L3 cache size
  • Has 4 more physical cores
Advantages of AMD Ryzen 7 5800X
  • 23% faster in a single-core Geekbench v5 test - 1626 vs 1317 points


Comparing the performance of CPUs in benchmarks
Cinebench R23 (Single-Core)
Cinebench R23 (Multi-Core)
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Geekbench 5 (Single-Core)
Geekbench 5 (Multi-Core)
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Full technical specification of AMD Ryzen 9 3900XT and Ryzen 7 5800X


Vendor AMD AMD
Released July 7, 2020 October 8, 2020
Type Desktop Desktop
instruction set x86-64 x86-64
Codename Zen 2 Vermeer
Socket AM4 AM4
Integrated GPU No No


Cores 12 8
Threads 24 16
Base Frequency 3.8 GHz 3.8 GHz
Turbo Boost Frequency 4.7 GHz 4.7 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 38x 38x
L1 Cache 64K (per core) 64K (per core)
L2 Cache 512K (per core) 512K (per core)
L3 Cache 64MB (shared) 32MB (shared)
Unlocked Multiplier Yes Yes


Transistors 3.8 billions -
Fabrication process 7 nm 7 nm
TDP 105 W 105 W
Max. temperature 95°C 90°C

Memory support

Memory types DDR4-3200 DDR4-3200
Memory Size 128 GB 128 GB
Max. Memory Channels 2 2
Max. Memory Bandwidth 47.68 GB/s 47.68 GB/s
ECC Support Yes Yes


Official site AMD Ryzen 9 3900XT official page AMD Ryzen 7 5800X official page
PCI Express Version 4.0 4.0
PCI Express Lanes 24 20

Cast your vote

Choose between two processors
158 (77.8%)
45 (22.2%)
Total votes: 203


So which CPU will you choose: AMD Ryzen 7 5800X or Ryzen 9 3900XT?