Comparison between Intel Core i9-9900K and Intel Core i5-8400
Both CPUs are manufactured by Intel.
Intel Core i9-9900K has a higher base speed of 3.6 GHz compared to Intel Core i5-8400's 2.8 GHz.
Intel Core i9-9900K has a higher turbo speed of 5.0 GHz compared to Intel Core i5-8400's 4.0 GHz.
Intel Core i9-9900K has more cores (8) compared to Intel Core i5-8400's 6 cores.
Intel Core i9-9900K supports more threads (16) compared to Intel Core i5-8400's 6 threads.
Both CPUs belong to the same class: Desktop.
Both CPUs use the same socket type: FCLGA1151-2.
Intel Core i9-9900K was launched in Q4 2018, while Intel Core i5-8400 was launched in Q4 2017.
Intel Core i9-9900K has a larger L3 cache of 16 MB compared to Intel Core i5-8400's 9 MB.
Specification Summary
The Intel Core i9-9900K and Intel Core i5-8400 are two processors with distinct specifications. Below is a detailed comparison of their key features:
Manufacturer: Both processors are manufactured by Intel.
Speed: The Intel Core i9-9900K has a base speed of 3.6 GHz, while the Intel Core i5-8400 runs at 2.8 GHz.
Turbo Boost: The Intel Core i9-9900K supports a turbo speed of 5.0 GHz, compared to 4.0 GHz for the Intel Core i5-8400.
Cores: The Intel Core i9-9900K has 8 cores, while the Intel Core i5-8400 has 6 cores.
Threads: The Intel Core i9-9900K supports 16 threads, compared to 6 threads for the Intel Core i5-8400.
Class: Both processors are designed for Desktop use.
Socket: The Intel Core i9-9900K uses the FCLGA1151-2, while the Intel Core i5-8400 uses the FCLGA1151-2.
Launch Date: The Intel Core i9-9900K was launched on Q4 2018, while the Intel Core i5-8400 was released on Q4 2017.
L3 Cache: The Intel Core i9-9900K has 16 MB of L3 cache, compared to 9 MB for the Intel Core i5-8400.
Detailed Specifications:
Specs
Intel Core i9-9900K
Intel Core i5-8400
Manufacturer
Intel
Intel
Speed
3.6 GHz
2.8 GHz
Turbo
5.0 GHz
4.0 GHz
Cores
8
6
Threads
16
6
Class
Desktop
Desktop
Socket
FCLGA1151-2
FCLGA1151-2
Launched
Q4 2018
Q4 2017
L3 Cache
16 MB
9 MB
Review:
Single Core Performance:
CPU Performance in single-threaded applications
Intel Core i9-9900K:
48%
Intel Core i5-8400:
39%
* More is Better
Multi Core Performance:
CPU Performance in multi-threaded applications
Intel Core i9-9900K
26%
Intel Core i5-8400:
13%
* More is Better
Power Efficiency:
Power Consumption of CPU under full load
Intel Core i9-9900K: 95 watts
23.75%
Intel Core i5-8400: 65 watts
16.25%
* Lower is Better
Launched Date:
Time when the CPU was launched
Intel Core i9-9900K : Q4 2018 ✅
Intel Core i5-8400 : Q4 2017 ✅
* Newer is Better
CPU Launch FINAL SCORE:
CPU Final Rating Ratings
Intel Core i9-9900K
Intel Core i5-8400
Pro's and Con's
Intel Core i9-9900K – Pros and Cons
Pros:
Newer Release: The Intel Core i9-9900K was launched more recently (Q4 2018) compared to the Intel Core i5-8400 (Q4 2017). This means it benefits from the latest advancements in technology, improved efficiency, and potentially better software optimization.
Higher Base Clock Speed: The Intel Core i9-9900K has a higher base clock speed of 3.6 GHz compared to the Intel Core i5-8400's 2.8 GHz. This results in better performance for single-threaded tasks and general responsiveness.
Higher Turbo Boost Speed: The Intel Core i9-9900K supports a higher turbo boost speed of 5.0 GHz compared to the Intel Core i5-8400's 4.0 GHz. This allows for better performance during peak workloads.
Faster Single-Core Performance: With a single-threaded performance score of 2927, the Intel Core i9-9900K outperforms the Intel Core i5-8400 (score: 2380). This makes it better suited for tasks that rely on single-core performance, such as gaming or everyday productivity.
Larger L3 Cache: The Intel Core i9-9900K features a larger L3 cache of 16MB compared to the Intel Core i5-8400's 9MB. A larger cache improves performance in memory-intensive tasks, such as video editing or 3D rendering, by reducing latency and speeding up data access.
Cons:
Higher Power Consumption: The Intel Core i9-9900K has a higher TDP of 95W compared to the Intel Core i5-8400's 65W. This means it may consume more power, leading to higher energy costs and potentially more heat generation, which could require better cooling solutions.
Intel Core i5-8400 – Pros and Cons
Pros:
Higher CPU Mark Score: The Intel Core i5-8400 has a higher CPU Mark score of 105.99 compared to the Intel Core i9-9900K's 49.45. This indicates better overall performance across a wide range of tasks.
Cons:
Fewer Cores: The Intel Core i5-8400 has 6 cores, which is fewer than the Intel Core i9-9900K's 8 cores. This could impact performance in multi-threaded workloads, such as rendering, compiling code, or running virtual machines.
Fewer Threads: The Intel Core i5-8400 has 6 threads, which is fewer than the Intel Core i9-9900K's 16 threads. This may limit its ability to handle highly parallel workloads efficiently.
Lower Multi-Core Performance: In multi-threaded tasks, the Intel Core i5-8400 scores 9235, which is lower than the Intel Core i9-9900K's score of 18245. This makes the Intel Core i9-9900K a better choice for heavy multitasking or parallel processing.
Productivity
Intel Core i9-9900K
This cpu Handles Mid Level level office applications, web browsing, and media playback with ease.
It can also be used for Mid Level level multitasking or CPU-intensive tasks like video editing or 3D rendering.
Intel Core i5-8400
This cpu Handles Entry Level level office applications, web browsing, and media playback with ease.
It can also be used for Entry Level level multitasking or CPU-intensive tasks like video editing or 3D rendering.
Gaming
Intel Core i9-9900K
Ideal for Mid Level level gaming (when paired with a dedicated GPU) and Mid Level level computing.
Intel Core i5-8400
Ideal for Entry Level level gaming (when paired with a dedicated GPU) and Entry Level level computing.
Verdict
Intel Core i9-9900K
The Intel Core i9-9900K is a reliable and Mid Level processor for your PC builds. It delivers excellent value for users with Mid Level computing needs or those building a New PC.
Intel Core i5-8400
The Intel Core i5-8400 is a reliable and Entry Level processor for your PC builds. It delivers excellent value for users with Entry Level computing needs or those building a New PC.
