Home > CPU Comparison > Ryzen 9 9900X or Ryzen 9 3900X: what's better?

AMD Ryzen 9 9900X vs Ryzen 9 3900X

85 out of 100
AMD Ryzen 9 9900X
VS
48 out of 100
AMD Ryzen 9 3900X
AMD Ryzen 9 9900X
AMD Ryzen 9 3900X

We compared two 12-core desktop CPUs: the 4.4 GHz AMD Ryzen 9 9900X 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.

  1. Review
  2. Differences
  3. Performance
  4. Specs
  5. Comments

Review

General overview and comparison of the processors
Single-Core Performance
Performance in single-threaded apps and benchmarks
Multi-Core Performance
Measure performance when all cores are involved
Power Efficiency
The efficiency score of power consumption
The "iGPU" and "Power Efficiency" have a minor impact on the NanoReview Score for desktop CPU.
NanoReview Final Score
Choose your main usage scenario to recalculate the Final Score and see which CPU suits your needs.
πŸ”Œ Usage Scenario:

Value for money (Beta)

Global average CPU prices are used by default! For better accuracy, enter your current prices and click β€œCalculate".
Currency
VS
71.1
(Good)
Value Index
23.6
(Mediocre)

Key Differences

What are the key differences between 3900X and 9900X
Advantages of AMD Ryzen 9 9900X
  • Newer - released 5 years later
  • 2x faster in a single-core Geekbench v6 test - 3340 vs 1699 points
  • Around 41.92 GB/s (88%) higher theoretical memory bandwidth
  • More modern manufacturing process – 4 versus 7 nanometers
  • Supports up to 192 GB DDR5-5600 RAM
  • Newer PCI Express version – 5.0
  • 22% higher Turbo Boost frequency (5.6 GHz vs 4.6 GHz)
  • Includes an integrated GPU Radeon Graphics

Test in Benchmarks

Comparing the performance of CPUs across various tasks
CPU:
Ryzen 9 9900X
vs
Ryzen 9 3900X

Cinebench

Reputable cross-platform benchmark for high-performance processors
Cinebench 2024 (Single)
Cinebench 2024 (Multi)
Cinebench 2026 (Single) 763 -
Cinebench 2026 (Multi) 7580 -
Cinebench Scores (42nd and 159th place)
Submit your benchmark results

GeekBench v6

The new version of this benchmark emulates common operations often used in real-world apps
Geekbench 6 (Single-Core)
Ryzen 9 9900X +97%
3340
Ryzen 9 3900X
1699
Geekbench 6 (Multi-Core)
Ryzen 9 9900X +87%
19543
Ryzen 9 3900X
10470
File compression 1510 MB/sec 872.1 MB/sec
Clang compilation 191.4 Klines/sec 104.4 Klines/sec
HTML 5 Browser 361.8 pages/sec 209.4 pages/sec
PDF Renderer 534 Mpixels/sec 299.9 Mpixels/sec
Text processing 350.5 pages/sec 144.4 pages/sec
Background blur 82.7 images/sec 41.1 images/sec
Photo processing 118.4 images/sec 75.2 images/sec
Ray tracing 45.5 Mpixels/sec 24.4 Mpixels/sec
Sources: GeekBench [1], [2] – 801 samples

PassMark

Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Ryzen 9 9900X +73%
4672
Ryzen 9 3900X
2703
Passmark CPU (Multi-Core)
Ryzen 9 9900X +67%
54325
Ryzen 9 3900X
32492
Integer math 180.5 GOps/sec 99.4 GOps/sec
Floating point math 119.7 GOps/sec 58.4 GOps/sec
Find prime numbers 432M Primes/sec 213M Primes/sec
Random string sorting 71.4M Strings/sec 48.2M Strings/sec
Data encryption 33.3 GBytes/sec 28.6 GBytes/sec
Data compression 678.8 MBytes/sec 448.8 MBytes/sec
Physics 3330 Frames/sec 1782 Frames/sec
Extended instructions 54.8B Matrices/sec 29.2B Matrices/sec
Sources: PassMark [3], [4] – 6489 & 17216 samples

Blender

3D rendering test that measures CPU performance in 3D modeling tasks (uses all cores)
Blender CPU
Ryzen 9 9900X +63%
454.53
Ryzen 9 3900X
278.98

Performance Per Watt

Shows the score you get per each watt of PL1 TDP
Cinebench 2024 / Watt 15.1 PPW 9.4 PPW
Geekbench 6 Multi / Watt 162.9 PPW 99.7 PPW
Passmark CPU Mark / Watt 452.7 PPW 309.4 PPW
Blender / Watt 3.79 PPW 2.66 PPW
These are rough calculations, as most CPUs surpass PL1 TDP wattage even in multicore workloads.

Recent User Tests

The latest benchmark tests that have been submitted by users
AMD Ryzen 9 9900X
DateBenchmarkResult
πŸ“˜ 2026-06-20 (Alenaes)Cinebench 2026773 / 7971
πŸ“˜ 2026-06-04 (Alenaes)Cinebench 2024139 / 1841
πŸ“˜ 2026-06-04 (Alenaes)Cinebench 2026763 / 7580
πŸ“˜ 2026-05-01 (PLL)Cinebench 2024137 / 1853
πŸ“˜ 2026-04-03 (freziontechno)Cinebench 2026759 / 7584
Add View all (28)
AMD Ryzen 9 3900X
DateBenchmarkResult
πŸ“˜ 2026-03-08 (Heliosgt)Cinebench 202476 / 1081
πŸ“˜ 2026-02-11 (Ethan)Cinebench 202469 / 778
πŸ“˜ 2026-01-30 (Amara)Cinebench 202475 / 986
πŸ“˜ 2025-11-16 (LegendryDrifter)GeekBench1821 / 11106
πŸ“˜ 2025-11-16 (LegendryDrifter)Cinebench 202479 / 1054
Add View all (9)

Specifications

Full technical specification of AMD Ryzen 9 9900X and Ryzen 9 3900X

General

Vendor Amd Amd
Released June 3, 2024 July 7, 2019
Type Desktop Desktop
Instruction Set x86-64 x86-64
Codename Zen 5 (Granite Ridge) -
Integrated GPU Radeon Graphics No
Rival Equivalent - Intel Core i9 14900K - Intel Core i9 9900K
Successor - - AMD Ryzen 9 9900X
AMD Ryzen CPU ranking (6th and 126th place)

CPU

Performance Cores
P-Cores 12 12
P-Threads 24 24
Base Frequency (P) 4.4 GHz 3.8 GHz
Turbo Boost Frequency (P) 5.6 GHz 4.6 GHz
Total
Total Cores 12 12
Total Threads 24 24
Bus Frequency 100 MHz 100 MHz
Multiplier 44x 38x
L1 Cache 80K (per core) 64K (per core)
L2 Cache 1MB (per core) 512K (per core)
L3 Cache 64MB (shared) 64MB (shared)
Unlocked Multiplier Yes Yes

Package

Transistors - 3.8 billions
Fabrication Process 4 nm 7 nm
TDP (PL1) 120 W 105 W
Max. Boost TDP (PL2) 162 W -
Socket AM5 AM4
Peak Temperature 95Β°C 95Β°C
Desktop CPU ranking (15th and 121st place)

iGPU

Integrated Graphics Radeon Graphics -
GPU Base Clock 400 MHz -
GPU Boost Clock 2200 MHz -
Shading Units 128 -
TMUs 8 -
ROPs 4 -
Execution Units 2 -
TGP 15 W -
iGPU FLOPS
Ryzen 9 9900X
0.6 TFLOPS
Ryzen 9 3900X
n/a
See: Radeon Graphics iGPU (Ryzen 7000) benchmarks

Memory Support

Memory Types - DDR5-5600 - DDR4-3200
Max. Memory Size 192 GB 128 GB
Memory Channels 2 2
Max. Memory Bandwidth 89.6 GB/s 47.68 GB/s
ECC Support Yes Yes

Misc

Official Site AMD Ryzen 9 9900X 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
2 (100%)
0 (0%)
Total votes: 2

Competitors

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7. AMD Ryzen 9 9900X vs Intel Core i7 14700K (1)
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Comments

So which CPU will you choose: AMD Ryzen 9 3900X or Ryzen 9 9900X?
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