Home > CPU Comparisons > Ryzen 9 3900X or Ryzen 7 5800X: what's better?

AMD Ryzen 9 3900X vs Ryzen 7 5800X

We compared two desktop CPUs: the 3.8 GHz AMD Ryzen 9 3900X 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 3900X
Advantages of AMD Ryzen 9 3900X
  • Has 32 MB larger L3 cache size
  • Has 4 more physical cores
Advantages of AMD Ryzen 7 5800X
  • Newer - released 1-year and 4-months later
  • 29% faster in a single-core Geekbench v5 test - 1704 vs 1320 points
  • 2% higher Turbo Boost frequency (4.7 GHz vs 4.6 GHz)


Comparing the performance of CPUs in benchmarks
Cinebench R20 (Single-Core)
Cinebench R20 (Multi-Core)
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Geekbench 5 (Single-Core)
Geekbench 5 (Multi-Core)


Full technical specification of AMD Ryzen 9 3900X and Ryzen 7 5800X


Vendor AMD AMD
Released July 7, 2019 October 8, 2020
Launch price 499 USD 449 USD
Type Desktop Desktop
Codename Zen 2 Zen 3
Socket AM4 AM4
Integrated GPU No No


Cores 12 8
Threads 24 16
Base Frequency 3.8 GHz 3.8 GHz
Turbo Boost Frequency 4.6 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 19.2 billions -
Fabrication process 7 nm 7 nm
TDP 105 W 105 W
Max. temperature 95°C 95°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 3900X official page AMD Ryzen 7 5800X official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 20

Cast your vote

Choose between two processors
829 (64.2%)
462 (35.8%)
Total votes: 1291


So which CPU will you choose: AMD Ryzen 7 5800X or Ryzen 9 3900X?
John Attiko 09 June 2021 00:59
The Ryzen 9 3900X is the better CPU, it has far more cache in order to process commands shared among the 24 threads and twelve cores, the package is demonstrably superior. Single core speed is not everything when there are other factors involved. PASSMARK shows a clear advantage, I am buying the 3900 in place of the 5800 I had planned for gaming purposes, but its your choice. The passmark
0 Reply
BLAZEnRUCH 26 March 2021 22:12
Which is better for streaming games ?
+86 Reply
pc expert 20 May 2021 07:41
r9 3900x is better than r7 5800x
+1 Reply
MIK 27 January 2021 09:05
Which is better on 3d modeling? ryzen 9 3900x or ryzen 7 5800x? or do you have any suggestions on CPU?
+47 Reply
Tek 08 February 2021 07:56
3900 due to the extra cores.
+25 Reply
EEE 15 November 2020 18:50
Which one is better for editing? (1400p and 4k)
+108 Reply
CR7 20 November 2020 03:13
3900X better for editing, 5800 for gaming
+53 Reply
Roman 12 November 2020 03:29
Which one should I get for gaming
+152 Reply
Niels 22 January 2021 23:03
The 5800X. Games nowadays still benefit more from single-core performance than sheer amount of cores.
+20 Reply
Don 25 October 2020 01:48
Was debating between the Ryzen 7 3700x and the Ryzen 7 5800x and I lucked into a Ryzen 9 3900x on Reddit Hardware Swap for $300 BNIB.
+20 Reply
Ryan 31 October 2020 02:06
Same. Except I was deciding 3700x vs 5600x for around $300. But came across a used one without cooler for $300. Hard to pass up.
+2 Reply
Waiting 22 October 2020 07:10
I'm in the same conundrum and I expect my decision will be entirely dependent upon availability. What can I actually order before the holidays?
+12 Reply
chris 20 October 2020 21:30
Came across this while comparing with other benchmarks and the 3900x is $50 cheaper than the 5800x msrp for me right now... I don't think the slight single core boost is worth it. 3900x is the better deal at $400 at microcenter right now.
+23 Reply
zzz 09 October 2020 20:49
So which one should I get?
+103 Reply
... 10 October 2020 09:35
3900X or 3700x.. ;)
+116 Reply