Intel Core i9 11900K vs AMD Ryzen 9 5900HX

We compared two 8-core CPUs: the 3.5 GHz Intel Core i9 11900K (desktop) against the 3.3 GHz AMD Ryzen 9 5900HX (laptop). 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 5900HX and 11900K
Advantages of Intel Core i9 11900K
  • Supports up to 128 GB DDR4-3200 RAM
  • Newer PCI Express version – 4.0
  • 15% higher Turbo Boost frequency (5.3 GHz vs 4.6 GHz)
  • 20% faster in a single-core Geekbench v5 test - 1830 vs 1524 points
Advantages of AMD Ryzen 9 5900HX
  • Consumes up to 57% less energy than the Core i9 11900K – 54 vs 125 Watt
  • More modern manufacturing process – 7 versus 14 nanometers
  • Around 18.27 GB/s (37%) 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 i9 11900K and AMD Ryzen 9 5900HX


Vendor Intel AMD
Released March 16, 2021 January 12, 2021
Type Desktop Laptop
instruction set x86-64 x86-64
Codename Rocket Lake Cezanne
Model number i9-11900K -
Socket LGA-1200 FP6
Integrated GPU UHD Graphics 750 Radeon RX Vega 8


Cores 8 8
Threads 16 16
Base Frequency 3.5 GHz 3.3 GHz
Turbo Boost Frequency 5.3 GHz 4.6 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 35x 33x
Bus Bandwidth 8 GT/s -
L1 Cache 64K (per core) 64K (per core)
L2 Cache 512K (per core) 512K (per core)
L3 Cache 16MB (shared) 16MB (shared)
Unlocked Multiplier Yes Yes


Fabrication process 14 nm 7 nm
TDP 125 W 35-54 W
Max. temperature 100°C 105°C


Integrated Graphics Intel UHD Graphics 750 Radeon RX Vega 8
GPU Base Clock 300 MHz -
GPU Boost Clock 1300 MHz 2100 MHz
Shading Units 256 512
TMUs 64 32
ROPs 32 8
Execution Units 32 -
TGP 15 W 15 W
Max. Resolution 3840x2160 - 60 Hz -

Memory support

Memory types DDR4-3200 DDR4-3200, LPDDR4-4266
Memory Size 128 GB 64 GB
Max. Memory Channels 2 2
Max. Memory Bandwidth 50 GB/s 68.27 GB/s
ECC Support No Yes


Official site Intel Core i9 11900K official page AMD Ryzen 9 5900HX official page
PCI Express Version 4.0 3.0
PCI Express Lanes 20 16

Cast your vote

Choose between two processors
51 (29.3%)
123 (70.7%)
Total votes: 174


So which CPU will you choose: AMD Ryzen 9 5900HX or Intel Core i9 11900K?
Timothy Campbell 15 December 2021 22:16
You should do both laptops when testing because desktop and laptop are set up differently.
+8 Reply