Intel Core i7 8700K vs AMD Ryzen 9 3900XT

We compared two desktop CPUs: the 3.7 GHz Intel Core i7 8700K 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 8700K
Advantages of Intel Core i7 8700K
  • Includes an integrated GPU Intel UHD Graphics 630
  • Consumes up to 10% less energy than the Ryzen 9 3900XT – 95 vs 105 Watt
Advantages of AMD Ryzen 9 3900XT
  • Has 52 MB larger L3 cache size
  • Newer - released 2-years and 10-months later
  • More modern manufacturing process – 7 versus 14 nanometers
  • Has 6 more physical cores
  • Newer PCI Express version – 4.0
  • Around 6.08 GB/s (15%) higher theoretical memory bandwidth


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 8700K and AMD Ryzen 9 3900XT


Vendor Intel AMD
Released October 5, 2017 July 7, 2020
Type Desktop Desktop
instruction set x86-64 x86-64
Codename Coffee Lake Zen 2
Model number i7-8700K -
Socket LGA-1151 AM4
Integrated GPU UHD Graphics 630 No


Cores 6 12
Threads 12 24
Base Frequency 3.7 GHz 3.8 GHz
Turbo Boost Frequency 4.7 GHz 4.7 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 37x 38x
Bus Bandwidth 8 GT/s -
L1 Cache 64K (per core) 64K (per core)
L2 Cache 256K (per core) 512K (per core)
L3 Cache 12MB (shared) 64MB (shared)
Unlocked Multiplier Yes Yes


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


Integrated Graphics Intel UHD Graphics 630 -
GPU Base Clock 350 MHz -
GPU Boost Clock 1200 MHz -
Shading Units 192 -
TMUs 24 -
ROPs 3 -
Execution Units 24 -
TGP 15 W -
Max. Resolution 4096x2304 - 60 Hz -

Memory support

Memory types DDR4-2666 DDR4-3200
Memory Size 128 GB 128 GB
Max. Memory Channels 2 2
Max. Memory Bandwidth 41.6 GB/s 47.68 GB/s
ECC Support No Yes


Official site Intel Core i7 8700K official page AMD Ryzen 9 3900XT official page
PCI Express Version 3.0 4.0
PCI Express Lanes 16 24
Extended instructions SSE4.1, SSE4.2, AVX-2 -

Cast your vote

Choose between two processors
4 (33.3%)
8 (66.7%)
Total votes: 12


So which CPU will you choose: AMD Ryzen 9 3900XT or Intel Core i7 8700K?