AMD Ryzen 9 7900X vs Ryzen 9 3900X

We compared two 12-core desktop CPUs: the 4.7 GHz AMD Ryzen 9 7900X against the 3.8 GHz Ryzen 9 3900X. 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 3900X and 7900X
Advantages of AMD Ryzen 9 7900X
  • Newer - released 3-years and 4-months later
  • 71% faster in a single-core Geekbench v5 test - 2273 vs 1327 points
  • Around 25.72 GB/s (54%) higher theoretical memory bandwidth
  • More modern manufacturing process – 5 versus 7 nanometers
  • Newer PCI Express version – 5.0
  • 22% higher Turbo Boost frequency (5.6 GHz vs 4.6 GHz)
  • Includes an integrated GPU AMD Radeon Graphics
Advantages of AMD Ryzen 9 3900X
  • Consumes up to 38% less energy than the Ryzen 9 7900X – 105 vs 170 Watt


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 7900X and Ryzen 9 3900X


Vendor AMD AMD
Released September 29, 2022 July 7, 2019
Type Desktop Desktop
instruction set x86-64 x86-64
Codename Raphael Zen 2
Socket AM5 AM4
Integrated GPU Radeon Graphics No


Cores 12 12
Threads 24 24
Base Frequency 4.7 GHz 3.8 GHz
Turbo Boost Frequency 5.6 GHz 4.6 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 47x 38x
L1 Cache 64K (per core) 64K (per core)
L2 Cache 1MB (per core) 512K (per core)
L3 Cache 64MB (shared) 64MB (shared)
Unlocked Multiplier Yes Yes


Transistors 6.57 billions 3.8 billions
Fabrication process 5 nm 7 nm
TDP 170 W 105 W
Max. temperature 95°C 95°C


Integrated Graphics AMD Radeon Graphics -
GPU Boost Clock 2200 MHz -

Memory support

Memory types DDR5-5200 DDR4-3200
Memory Size 128 GB 128 GB
Max. Memory Channels 2 2
Max. Memory Bandwidth 73.4 GB/s 47.68 GB/s
ECC Support Yes Yes


Official site AMD Ryzen 9 7900X official page AMD Ryzen 9 3900X official page
PCI Express Version 5.0 4.0
PCI Express Lanes 28 16

Cast your vote

Choose between two processors
20 (47.6%)
22 (52.4%)
Total votes: 42


So which CPU will you choose: AMD Ryzen 9 3900X or Ryzen 9 7900X?