Intel Core i9 9900X vs i9 9900K

We compared two desktop CPUs: the 3.5 GHz Intel Core i9 9900X with 10-cores against the 3.6 GHz i9 9900K with 8-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 9900K and 9900X
Advantages of Intel Core i9 9900X
  • Supports quad-channel memory
  • Has 2 more physical cores
  • Has 4 MB larger L3 cache size
Advantages of Intel Core i9 9900K
  • Consumes up to 42% less energy than the Core i9 9900X – 95 vs 165 Watt
  • Includes an integrated GPU Intel UHD Graphics 630
  • More than 8° C higher critical temperature
  • 14% higher Turbo Boost frequency (5 GHz vs 4.4 GHz)


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 9900X and i9 9900K


Vendor Intel Intel
Released October 8, 2018 October 8, 2018
Type Desktop Desktop
instruction set x86-64 x86-64
Codename Skylake Coffee Lake
Model number i9-9900X i9-9900K
Socket LGA-2066 LGA-1151
Integrated GPU No UHD Graphics 630


Cores 10 8
Threads 20 16
Base Frequency 3.5 GHz 3.6 GHz
Turbo Boost Frequency 4.4 GHz 5 GHz
Bus frequency 100 MHz 100 MHz
Multiplier 35x 36x
Bus Bandwidth 8 GT/s 8 GT/s
L1 Cache 64K (per core) 64K (per core)
L2 Cache 1MB (per core) 256K (per core)
L3 Cache 20MB (shared) 16MB (shared)
Unlocked Multiplier Yes Yes


Fabrication process 14 nm 14 nm
TDP 165 W 95 W
Max. temperature 92°C 100°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 DDR4-2666
Memory Size 128 GB 128 GB
Max. Memory Channels 4 2
Max. Memory Bandwidth - 41.6 GB/s
ECC Support No No


Official site Intel Core i9 9900X official page Intel Core i9 9900K official page
PCI Express Version 3.0 3.0
PCI Express Lanes 44 16
Extended instructions SSE4.1, SSE4.2, AVX-2, AVX-512 SSE4.1, SSE4.2, AVX-2

Cast your vote

Choose between two processors
7 (26.9%)
19 (73.1%)
Total votes: 26


So which CPU will you choose: Intel Core i9 9900K or i9 9900X?
Roy Gantt 21 May 2022 23:11
I actually own the 9900K but have not seen evidence of the UHD 630 integrated graphics please email instructions (if possible). Thanks, I'd be eternally grateful!
0 Reply
Sergey 22 May 2022 13:05
If your motherboard support video output, you can connect the monitor to it.
0 Reply