Intel Core i7 7800X vs AMD Ryzen 9 3900XT

We compared two desktop CPUs: the 3.5 GHz Intel Core i7 7800X with 6-cores against the 3.8 GHz AMD Ryzen 9 3900XT with 12-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 3900XT and 7800X
Advantages of Intel Core i7 7800X
  • Supports quad-channel memory
  • Around 31.79 GB/s (67%) higher theoretical memory bandwidth
Advantages of AMD Ryzen 9 3900XT
  • Has 56 MB larger L3 cache size
  • Newer - released 3-years and 2-months later
  • More modern manufacturing process – 7 versus 14 nanometers
  • Has 6 more physical cores
  • Consumes up to 25% less energy than the Core i7 7800X – 105 vs 140 Watt
  • Newer PCI Express version – 4.0
  • 18% higher Turbo Boost frequency (4.7 GHz vs 4 GHz)
  • 22% faster in a single-core Geekbench v5 test - 1309 vs 1075 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 i7 7800X and AMD Ryzen 9 3900XT


Vendor Intel AMD
Released May 30, 2017 July 7, 2020
Type Desktop Desktop
instruction set x86-64 x86-64
Codename Skylake Zen 2
Model number i7-7800X -
Socket LGA-2066 AM4
Integrated GPU No No


Cores 6 12
Threads 12 24
Base Frequency 3.5 GHz 3.8 GHz
Turbo Boost Frequency 4 GHz 4.7 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 35x 38x
Bus Bandwidth 8 GT/s -
L1 Cache 64K (per core) 64K (per core)
L2 Cache 1MB (per core) 512K (per core)
L3 Cache 8MB (shared) 64MB (shared)
Unlocked Multiplier Yes Yes


Transistors - 3.8 billions
Fabrication process 14 nm 7 nm
TDP 140 W 105 W
Max. temperature 100°C 95°C

Memory support

Memory types DDR4-2400 DDR4-3200
Memory Size 128 GB 128 GB
Max. Memory Channels 4 2
Max. Memory Bandwidth 79.47 GB/s 47.68 GB/s
ECC Support No Yes


Official site Intel Core i7 7800X official page AMD Ryzen 9 3900XT official page
PCI Express Version 3.0 4.0
PCI Express Lanes 28 24
Extended instructions SSE4.1, SSE4.2, AVX-2, AVX-512 -

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So which CPU will you choose: AMD Ryzen 9 3900XT or Intel Core i7 7800X?