Home > CPU Comparisons > Ryzen 9 5900X or Ryzen 9 3900X: what's better?

AMD Ryzen 9 5900X vs Ryzen 9 3900X

We compared two 12-core desktop CPUs: the 3.7 GHz AMD Ryzen 9 5900X 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 5900X
Advantages of AMD Ryzen 9 5900X
  • Newer - released 1-year and 3-months later
  • 4% higher Turbo Boost frequency (4.8 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 5900X and Ryzen 9 3900X
Cores 12 12
Threads 24 24
Base Frequency 3.7 GHz 3.8 GHz
Turbo Boost Frequency 4.8 GHz 4.6 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 37x 38x
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 - 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 No Yes
Vendor AMD AMD
Released October 8, 2020 July 7, 2019
Launch price 549 USD 499 USD
Type Desktop Desktop
Codename Zen 3 Zen 2
Socket AM4 AM4
Integrated GPU No No
Official site AMD Ryzen 9 5900X official page AMD Ryzen 9 3900X official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 20

Cast your vote

Choose between two processors
277 (52.4%)
252 (47.6%)
Total votes: 529


So which CPU will you choose: AMD Ryzen 9 3900X or Ryzen 9 5900X?
notimportant 14 November 2020 16:20
upgrade only if you need to, if its required for your work. if gaming is your mainstay then 3900 is way over the top even now even for 4-8k gaming. if your working with freelance, Designe, compression, rendering or movie editing where every minute is a lost revenue then yes upgrading is the best option but then we still have problems with current generation instability that always corps up and if your working, any downtime is lost revenue that's why i always stay 1 generation behind so I wont have to deal with "Problems" that equal lost revenue, stability is king when it comes to my work rig. oh and there is no such thing as Future Proofing in this industry even if i buy a 5950 today there is no guarantee it wont be a bottleneck for next gen Quadro GPUS or hardware upgrades. buy what you need not what you think you need. running previous generation hardware has saved me so Manny headaches when working, money and made me more money. that being said I'm still running Intel and i wont change from intel for my work rig, AMD has not been trustworthy with Bios and Drivers for their hardware, i still remember when i got swamped in work requests cause people who jumped on the Zen 2 craze couldn't get work done, due to AMD's little unprofessional hiccups, that being said 5800x and 6900xt is going straight in to my gaming ring when you can find them available.
+3 Reply
JoeComputer 01 November 2020 04:43
I have the 3900x and looking to see if the 5900x is worth the up grade or just go to the 5950x since that thing is a Monster!
0 Reply
Jeff 05 November 2020 04:53
It seems that 5900X isn't worth, as the specs are very similar and the benchmarks aren't so different. As 5000 series is (probably) the last one using AM4 socket, i will keep my 3900X and jump to 6000 series / AM5 socket, with DDR5 and PCI-E 5.0. Of course, this is just my opinion.
+9 Reply
Chak 05 November 2020 19:10
Jeff, I am in the same boat, after seeing some modest increase in FPS in games, the difference is not enough to justify a 500$+ purchase especially since I've only had the 3900x less than a year.
+7 Reply
Dan 09 November 2020 05:18
Jeff, Your novice interpretation behind these technologies is flawed and wrong. You should read about the IPC gains from the chiplets using one L3 cache instead of 2 L3 caches and how these chips are architecturally different. If you don't understand how to analyze technology or how it functions you should buy whatever is the cheapest thing possible because you're clueless.
+20 Reply
Guest User #433 25 November 2020 07:52
Chak, And god only knows when it will actually be here. i am really surprised there is almost no difference between these two chips. Only reason i'm back on intel was the vendor sold me THREE ryzen cpus that had missing pins. And this was not some dodgy small shop. At the time missing pins was a big issue. But i think i will wait.
+3 Reply