INTEL

Intel Core i9-9940X

Intel processor specifications and benchmark scores

14
Cores
28
Threads
4.5
GHz Boost
165W
TDP
πŸ”“Unlocked

Intel Core i9-9940X Specifications

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Core i9-9940X Core Configuration

Processing cores and threading

The Intel Core i9-9940X features 14 physical cores and 28 threads, which directly impacts multi-threaded performance in CPU benchmarks. More cores allow the processor to handle parallel workloads efficiently, improving performance in video editing, 3D rendering, and multitasking scenarios. Thread count determines how many simultaneous tasks the CPU can process, with higher thread counts benefiting productivity applications and content creation workflows.

Cores
14
Threads
28
SMP CPUs
1
⏱️

i9-9940X Clock Speeds

Base and boost frequencies

Clock speed is a critical factor in Core i9-9940X benchmark performance, measured in GHz. The base clock represents the guaranteed operating frequency, while the boost clock indicates maximum single-core performance under optimal conditions. Higher clock speeds translate to faster single-threaded performance, which is essential for gaming and applications that don't fully utilize multiple cores. The Core i9-9940X by Intel can dynamically adjust its frequency based on workload and thermal headroom.

Base Clock
3.3 GHz
Boost Clock
4.5 GHz
Multiplier
33x πŸ”“
πŸ’Ύ

Intel's Core i9-9940X Cache Hierarchy

L1, L2, L3 cache sizes

Cache memory is ultra-fast storage built directly into the i9-9940X processor die. L1 cache provides the fastest access for frequently used data, while L2 and L3 caches offer progressively larger storage with slightly higher latency. Larger cache sizes significantly improve CPU benchmark scores by reducing memory access times. The Core i9-9940X's cache configuration is optimized for both gaming performance and productivity workloads, minimizing data fetch delays during intensive computations.

L1 Cache
64 KB (per core)
L2 Cache
1 MB (per core)
L3 Cache
19.25 MB (shared)
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Skylake Architecture & Process

Manufacturing and design details

The Intel Core i9-9940X is built on Intel's 14 nm manufacturing process, which determines power efficiency and thermal characteristics. Smaller process nodes allow for more transistors in the same space, enabling higher performance per watt. The architecture defines how the processor handles instructions and manages data flow, directly impacting benchmark results across different workload types. Modern CPU architectures like the one in i9-9940X incorporate advanced branch prediction and out-of-order execution for optimal performance.

Architecture
Skylake
Codename
Skylake-X
Process Node
14 nm
Foundry
Intel
Die Size
484 mmΒ²
Generation
Core i9 (X-Series 9th Gen)
πŸ”’

Skylake Instruction Set Features

Supported CPU instructions and extensions

The Core i9-9940X by Intel supports various instruction set extensions that enable optimized performance for specific workloads. SIMD instructions like SSE and AVX accelerate multimedia, scientific computing, and AI workloads by processing multiple data points simultaneously. Features like AES-NI provide hardware-accelerated encryption, while AVX-512 (if supported) enables advanced vector processing for data centers and high-performance computing. These instruction sets are critical for software compatibility and performance in modern applications.

MMX
SSE
SSE2
SSE3
SSSE3
SSE4.1
SSE4.2
AVX
AVX2
FMA3
AES-NI
F16C
BMI1
BMI2
Intel 64
VT-x
VT-d
πŸ”Œ

i9-9940X Power & Thermal

TDP and power specifications

The Intel Core i9-9940X has a TDP (Thermal Design Power) of 165W, indicating the cooling solution required for sustained operation. TDP affects both system power consumption and the type of cooler needed. Lower TDP processors are ideal for compact builds and laptops, while higher TDP chips typically offer better sustained performance in demanding CPU benchmarks. Understanding power requirements helps ensure your system can deliver consistent performance without thermal throttling.

TDP
165W
πŸ”§

Intel Socket 2066 Platform & Socket

Compatibility information

The Core i9-9940X uses the Intel Socket 2066 socket, which determines motherboard compatibility. Choosing the right platform is essential for building a system around this processor. The socket type also influences available features like PCIe lanes, memory support, and upgrade paths. When comparing CPU benchmarks, ensure you're looking at processors compatible with your existing or planned motherboard to make informed purchasing decisions.

Socket
Intel Socket 2066
PCIe
Gen 3, 44 Lanes(CPU only)
Package
FC-LGA2066
DDR5

Intel Socket 2066 Memory Support

RAM compatibility and speeds

Memory support specifications for the i9-9940X define which RAM types and speeds are compatible. Faster memory can significantly improve CPU benchmark performance, especially in memory-intensive applications and gaming. The memory controller integrated into the Core i9-9940X determines maximum supported speeds and channels. Dual-channel or quad-channel memory configurations can double or quadruple memory bandwidth, providing noticeable performance gains in content creation and scientific workloads.

Memory Type
DDR4
Memory Bus
Quad-channel
Memory Bandwidth
85.3 GB/s
πŸ“¦

Core i9-9940X Product Information

Release and pricing details

The Intel Core i9-9940X is manufactured by Intel and represents their commitment to delivering competitive CPU performance. Understanding the release date and pricing helps contextualize benchmark comparisons with other processors from the same generation. Launch pricing provides a baseline for evaluating value, though street prices often differ. Whether you're building a new system or upgrading, the Core i9-9940X by Intel offers a specific balance of performance, features, and cost within Intel's product lineup.

Manufacturer
Intel
Release Date
Oct 2018
Launch Price
$1387
Market
Desktop
Status
End-of-life
Part Number
SREZ5
Bundled Cooler
None

Core i9-9940X Benchmark Scores

cinebench_cinebench_r15_multicoreSource

Cinebench R15 multi-core renders a complex 3D scene using all CPU threads simultaneously. This test reveals how Intel Core i9-9940X performs in parallel rendering workloads.

cinebench_cinebench_r15_multicore #312 of 1788
2,408
16%
Max: 14,978
Compare with other CPUs

cinebench_cinebench_r15_singlecoreSource

Cinebench R15 single-core measures the speed of one CPU thread rendering 3D geometry. This score indicates how Intel Core i9-9940X handles tasks that can't be parallelized.

cinebench_cinebench_r15_singlecore #311 of 1245
339
16%
Max: 2,114

cinebench_cinebench_r20_multicoreSource

Cinebench R20 multi-core uses a scene requiring 4x more computational power than R15. This test better reflects modern CPU capabilities for professional rendering on Intel Core i9-9940X. The more demanding workload provides better differentiation between current-generation processors. Content creators and 3D artists use this benchmark to estimate real-world render performance.

cinebench_cinebench_r20_multicore #312 of 1788
10,036
16%
Max: 62,412
Compare with other CPUs

cinebench_cinebench_r20_singlecoreSource

Cinebench R20 single-core tests one thread against a more demanding scene than R15. This reveals the true single-thread rendering capability of Intel Core i9-9940X. The increased complexity provides more accurate performance differentiation between modern CPUs. Single-thread performance remains critical for gaming and applications with serial bottlenecks.

cinebench_cinebench_r20_singlecore #312 of 1784
1,416
16%
Max: 8,811
Compare with other CPUs

cinebench_cinebench_r23_multicoreSource

Cinebench R23 multi-core is the current standard for CPU rendering benchmarks with a 10-minute minimum runtime. This extended test reveals sustained performance of Intel Core i9-9940X after thermal limits kick in. The longer duration exposes cooling limitations that shorter benchmarks miss. Professional users rely on R23 scores to predict real-world rendering performance under sustained workloads.

cinebench_cinebench_r23_multicore #312 of 1788
23,897
16%
Max: 148,601
Compare with other CPUs

πŸ† Top 5 Performers

cinebench_cinebench_r23_singlecoreSource

Cinebench R23 single-core measures sustained single-thread performance over 10 minutes. This reveals how Intel Core i9-9940X maintains boost clocks under continuous load. The extended runtime shows whether thermal throttling affects single-core performance. This score is particularly important for understanding real-world responsiveness beyond initial boost behavior.

cinebench_cinebench_r23_singlecore #311 of 1788
3,373
16%
Max: 20,979
Compare with other CPUs

geekbench_multicoreSource

Geekbench multi-core tests Intel Core i9-9940X across real-world workloads including image processing, machine learning, and data compression. All available threads are utilized to measure parallel performance. Higher scores indicate better capability in multitasking and content creation. The cross-platform nature of Geekbench allows direct comparison with systems running different operating systems.

geekbench_multicore #101 of 711
10,466
46%
Max: 22,515
Compare with other CPUs

πŸ† Top 5 Performers

geekbench_singlecoreSource

Geekbench single-core measures how fast one thread of Intel Core i9-9940X can process tasks like web browsing and document editing. This score correlates with how snappy the system feels during normal use. Many applications still depend primarily on single-thread performance. Gaming performance is also heavily influenced by single-core speed in CPU-limited scenarios.

geekbench_singlecore #295 of 711
1,468
43%
Max: 3,401
Compare with other CPUs

About Intel Core i9-9940X

The Intel Core i9-9940X, a beast from the X-Series 9th Gen lineup, delivers powerhouse performance that’s built for heavy multitasking and CPU-intensive workloads. With 14 cores and 28 threads running up to 4.50 GHz in Turbo mode, this 14nm chip crushes content creation, 3D rendering, and video editing backed by a massive 19.25 MB of L3 cache and a solid 23,897 in Cinebench R23 multicore. Whether you're streaming while gaming or rendering complex simulations, the i9-9940X handles it with minimal slowdown, making it a favorite among power users who demand raw throughput. Its Geekbench multicore score of 10,466 puts it ahead of most mainstream desktop CPUs, though it's not the latest architecture, it still holds up in professional workflows. While the 165W TDP means you’ll need robust cooling, the performance payoff is real for those pushing their rigs to the limit. When it comes to gaming, the Intel Core i9-9940X (Intel) doesn’t dominate quite as hard modern titles rarely utilize all 28 threads, so you’re paying for overhead that doesn’t always translate to higher FPS. Still, with a strong single-core score of 3,373 in Cinebench R23, it keeps up in demanding games, especially when paired with a high-end GPU. However, the $1,387 launch price makes its price-to-performance ratio tough to justify today, especially compared to newer Ryzen or Intel Core offerings. You’ll also need to factor in compatibility: it runs on the Intel Socket 2066, which limits you to X299 motherboards, adding cost and complexity to the build. For millennials building a dream workstation in 2018, the i9-9940X was a flex; today, it's more of a niche pick for used-market enthusiasts. That said, if you score one at a discount, this 14-core monster still brings serious muscle to the table.

The AMD Equivalent of Core i9-9940X

Looking for a similar processor from AMD? The AMD Ryzen 9 3900X offers comparable performance and features in the AMD lineup.

AMD Ryzen 9 3900X

AMD β€’ 12 Cores

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Popular Intel Core i9-9940X Comparisons

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