AMD Ryzen 9 5900X vs Ryzen 9 3950X

We compared two desktop CPUs: the 3.7 GHz AMD Ryzen 9 5900X with 12-cores against the 3.5 GHz Ryzen 9 3950X with 16-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 3950X and 5900X
Advantages of AMD Ryzen 9 5900X
  • Newer - released 11-months later
  • 28% faster in a single-core Geekbench v5 test - 1644 vs 1282 points
  • 2% higher Turbo Boost frequency (4.8 GHz vs 4.7 GHz)
Advantages of AMD Ryzen 9 3950X
  • Has 4 more physical cores


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 5900X and Ryzen 9 3950X


Vendor AMD AMD
Released October 8, 2020 November 25, 2019
Type Desktop Desktop
instruction set x86-64 x86-64
Codename Vermeer Zen 2
Socket AM4 AM4
Integrated GPU No No


Cores 12 16
Threads 24 32
Base Frequency 3.7 GHz 3.5 GHz
Turbo Boost Frequency 4.8 GHz 4.7 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 37x 35x
L1 Cache 64K (per core) 64K (per core)
L2 Cache 512K (per core) 512K (per core)
L3 Cache 64MB (shared) 64MB (shared)
Unlocked Multiplier Yes Yes


Transistors - 3.8 billions
Fabrication process 7 nm 7 nm
TDP 105 W 105 W
Max. temperature 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 5900X official page AMD Ryzen 9 3950X official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 16

Cast your vote

Choose between two processors
366 (62.9%)
216 (37.1%)
Total votes: 582


So which CPU will you choose: AMD Ryzen 9 3950X or Ryzen 9 5900X?
Mike 09 April 2021 04:36
I’ve ran both on same motherboard the 3950 seams stronger to me
+14 Reply
zippyfan 03 December 2020 15:03
I'm not really into gaming. I'm thinking of getting a used 3950x. It scores slightly better for multi-core productivity applications. I think amd made great strides in single core performance this time around but not so much in multi-core performance. It's not enough for me to jump to the latest generation.
+1 Reply
Ruben 18 October 2020 11:44
I'm currently debating whether I should get a used 3950X for 500€ or hope the 5900X retails at MSRP and get that for 550€. Maybe used prices drop for the former some more after the Zen 3 release.
+41 Reply
Root 18 October 2020 15:31
I'd go for a used 3950X.
+38 Reply