Intel Core i9 7920X vs AMD Ryzen 9 3900X

We compared two 12-core desktop CPUs: the 2.9 GHz Intel Core i9 7920X against the 3.8 GHz AMD 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 7920X
Advantages of Intel Core i9 7920X
  • Supports quad-channel memory
Advantages of AMD Ryzen 9 3900X
  • Has 47 MB larger L3 cache size
  • More modern manufacturing process – 7 versus 14 nanometers
  • Newer - released 1-year and 11-months later
  • Consumes up to 25% less energy than the Core i9 7920X – 105 vs 140 Watt
  • Newer PCI Express version – 4.0
  • 7% higher Turbo Boost frequency (4.6 GHz vs 4.3 GHz)
  • 13% faster in a single-core Geekbench v5 test - 1300 vs 1147 points


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 Intel Core i9 7920X and AMD Ryzen 9 3900X


Vendor Intel AMD
Released August 7, 2017 July 7, 2019
Type Desktop Desktop
instruction set x86-64 x86-64
Codename Skylake Zen 2
Model number i9-7920X -
Socket LGA-2066 AM4
Integrated GPU No No


Cores 12 12
Threads 24 24
Base Frequency 2.9 GHz 3.8 GHz
Turbo Boost Frequency 4.3 GHz 4.6 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 29x 38x
Bus Bandwidth 8 GT/s -
L1 Cache 64K (per core) 64K (per core)
L2 Cache 1MB (per core) 512K (per core)
L3 Cache 17MB (shared) 64MB (shared)
Unlocked Multiplier Yes Yes


Transistors - 3.8 billions
Fabrication process 14 nm 7 nm
TDP 140 W 105 W
Max. temperature 95°C 95°C

Memory support

Memory types DDR4-2666 DDR4-3200
Memory Size 128 GB 128 GB
Max. Memory Channels 4 2
Max. Memory Bandwidth - 47.68 GB/s
ECC Support No Yes


Official site Intel Core i9 7920X official page AMD Ryzen 9 3900X official page
PCI Express Version 3.0 4.0
PCI Express Lanes 44 16
Extended instructions SSE4.1, SSE4.2, AVX-2, AVX-512 -

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So which CPU will you choose: AMD Ryzen 9 3900X or Intel Core i9 7920X?