Intel Core i9-9940X

Intel Core i9-9940X

Intel Core i9-9940X: In-Depth Processor Expertise for Professionals (2025)

Current analysis for those who seek power and multitasking


Key Features: Architecture and Performance

The Intel Core i9-9940X processor, released in 2019, remains in demand in niche scenarios due to its unique characteristics.

Architecture and Technology Process

- Codename: Skylake-X (Skylake architecture adapted for HEDT platforms).

- Technology Process: 14 nm (Intel 14nm++), which is considered outdated by 2025 but ensures stability.

- Cores and Threads: 14 cores / 28 threads — ideal for parallel tasks.

- Frequencies: Base — 3.3 GHz, Turbo Boost Max 3.0 — up to 4.4 GHz.

Key Features:

- Support for AVX-512 for accelerated scientific calculations and rendering.

- Unlocked multiplier for overclocking (requires powerful cooling).

- 20 MB L3 cache — minimizes latencies when working with large data sets.

Performance:

- Geekbench 6: 1328 (Single-Core) / 9787 (Multi-Core). For comparison, the Ryzen 9 7950X (2023) scores ~2200/22000, but the i9-9940X remains relevant for tasks where stability and AVX-512 support are critical.


Compatible Motherboards: Sockets and Chipsets

The LGA 2066 platform and Intel X299 chipset form the foundation for building a system.

Recommended Models (2025):

- ASUS ROG Rampage VI Extreme (price: ~$350–$450) — the best choice for overclocking, 8 DDR4 slots, Wi-Fi 6.

- MSI X299 Gaming Pro Carbon AC (~$250–$300) — a balance of price and functionality, ARGB lighting.

- Gigabyte X299 AORUS Ultra Gaming (~$280) — reliable VRM and 3 M.2 slots.

Selection Features:

- PCIe 3.0: No support for PCIe 4.0/5.0 — limits speed for modern SSDs and graphics cards.

- Number of PCIe lanes: Up to 44 lanes (including chipset lanes), allowing for multiple GPUs or NVMe drives.

- VRM Cooling: Due to a TDP of 165 W, it is critically important to choose boards with MOSFET heatsinks.


Supported Memory: DDR4 and Tuning Details

- Memory type: Only DDR4 (up to 256 GB, 8 slots).

- Frequencies: Officially — up to 2666 MHz, but overclocking to 3600+ MHz is possible on compatible boards.

- Modes: Quad-channel (4 channels) — modules must be installed in the correct slots for maximum bandwidth.

Example Configuration:

- For workstations: 64 GB (4x16 GB) DDR4-3200 CL16 (Corsair Vengeance LPX, ~$180).

- For enthusiasts: 128 GB DDR4-3600 (G.Skill Trident Z RGB, ~$400).


Power Supplies: Power Calculation

- Recommended power: From 750 W (considering overclocking and a top-tier GPU).

- Certification: 80+ Gold or Platinum (Corsair RM850x — $150, Seasonic PRIME TX-750 — $200).

Example:

A system with RTX 4080 (320 W) + i9-9940X (overclocked to 4.8 GHz) consumes ~600 W. A buffer of 150–200 W is necessary for peak loads.


Pros and Cons

Pros:

1. Multithreading performance: 28 threads handle rendering in Blender or code compilation faster than many modern mid-range CPUs.

2. AVX-512: Accelerates machine learning tasks (e.g., TensorFlow optimized for Intel).

3. Repairability: The LGA 2066 platform is actively supported in the secondary market.

Cons:

1. Power consumption: 165 W TDP — high heat generation and cooling requirements.

2. Outdated technology process: 14 nm compared to 5–7 nm of Ryzen 7000/8000.

3. No PCIe 5.0/DDR5: Limitation for upgrading to modern components.


Use Cases

1. Work Tasks:

- 3D rendering: In Autodesk Maya or Cinema 4D, the processor shows results on par with Ryzen 9 7900X.

- Video encoding: HandBrake or Adobe Premiere Pro — 4K rendering in 25–30 minutes (compared to 15–20 for Ryzen 9 7950X).

2. Gaming:

- In Full HD with RTX 4070 Ti — 120–140 FPS in Cyberpunk 2077 (high settings), but in CPU-bound scenarios, it lags behind Core i5-14600K.

3. Multimedia:

- Streaming in OBS + gaming — thanks to 28 threads, the load is distributed without lags.


Comparison with Competitors

1. AMD Ryzen 9 7950X ($550–$600):

- 16 cores / 32 threads, 5 nm, DDR5, PCIe 5.0.

- Geekbench 6 Multi-Core: ~22000 (2.2 times higher).

- Conclusion: Ryzen excels in energy efficiency, but i9-9940X is cheaper on the secondary market (~$300–$400).

2. Intel Core i9-13900K ($500–$550):

- 24 cores (8P+16E), DDR5, PCIe 5.0.

- Excels in single-threaded tasks (Geekbench 6 Single-Core: ~2700).

3. AMD Threadripper 3960X (24 cores, $700–$800 used):

- For those needing more PCIe lanes and memory, but at a higher price.


Practical Assembly Tips

1. Cooling:

- Liquid Cooling: NZXT Kraken X63 (280 mm) or Arctic Liquid Freezer II 360.

- Air Cooling: Noctua NH-D15 (maximum compatibility).

2. Case: Minimum 6 slots for fans (Lian Li Lancool III, Fractal Design Meshify 2).

3. Storage:

- System drive: Samsung 990 Pro 1 TB (PCIe 4.0, but works on PCIe 3.0).

- File storage: 2x4 TB HDD (RAID 1).

4. Network Solutions:

- Additional Wi-Fi 6E card (if not integrated into the motherboard).


Final Conclusion: Who Should Choose i9-9940X in 2025?

This processor is worth choosing if:

- You are a professional: Work with rendering, CAD, or scientific calculations, and AVX-512 is critically important.

- Budget is limited: Buying on the secondary market ($300–$400) is more advantageous than a new Ryzen 9.

- Stability is necessary: Proven X299 platform, supporting Windows 10/11 and Linux.

Don’t choose the i9-9940X if:

- You plan to upgrade to DDR5 or PCIe 5.0.

- You are looking for a CPU for gaming — modern Core i5/Ryzen 5 will be more efficient.


The Intel Core i9-9940X in 2025 is a tool for those who value a balance between price and multithreaded power, willing to compromise with an archaic technology process for specific tasks.

Basic

Label Name
Intel
Platform
Desktop
Launch Date
October 2018
Model Name
?
The Intel processor number is just one of several factors - along with processor brand, system configurations, and system-level benchmarks - to be considered when choosing the right processor for your computing needs.
i9-9940X
Code Name
Skylake

CPU Specifications

Total Cores
?
Cores is a hardware term that describes the number of independent central processing units in a single computing component (die or chip).
14
Total Threads
?
Where applicable, Intel® Hyper-Threading Technology is only available on Performance-cores.
28
Performance-cores
14
Performance-core Base Frequency
3.3 GHz
Performance-core Max Turbo Frequency
?
Maximum P-core turbo frequency derived from Intel® Turbo Boost Technology.
4.4 GHz
L1 Cache
64K per core
L2 Cache
1MB per core
L3 Cache
20MB shared
Unlocked Multiplier
Yes
Multiplier
33x
Bus Frequency
100MHz
CPU Socket
?
The socket is the component that provides the mechanical and electrical connections between the processor and motherboard.
LGA-2066
Technology
?
Lithography refers to the semiconductor technology used to manufacture an integrated circuit, and is reported in nanometer (nm), indicative of the size of features built on the semiconductor.
14 nm
TDP
165 W
Max. Operating Temperature
?
Junction Temperature is the maximum temperature allowed at the processor die.
88 °C
PCIe Version
?
PCI Express is a high-speed serial computer expansion bus standard used for connecting high-speed components, replacing older standards such as AGP, PCI, and PCI-X. It has gone through multiple revisions and improvements since its initial release. PCIe 1.0 was first introduced in 2002, and in order to meet the growing demand for higher bandwidth, subsequent versions have been released over time.
3.0
Instruction Set
?
The instruction set is a hard program stored inside the CPU that guides and optimizes CPU operations. With these instruction sets, the CPU can run more efficiently. There are many manufacturers that design CPUs, which results in different instruction sets, such as the 8086 instruction set for the Intel camp and the RISC instruction set for the ARM camp. x86, ARM v8, and MIPS are all codes for instruction sets. Instruction sets can be extended; for example, x86 added 64-bit support to create x86-64. Manufacturers developing CPUs that are compatible with a certain instruction set need authorization from the instruction set patent holder. A typical example is Intel authorizing AMD, enabling the latter to develop CPUs compatible with the x86 instruction set.
x86-64

Memory Specifications

Memory Type
?
Intel® processors come in four different types: Single Channel, Dual Channel, Triple Channel, and Flex Mode. Maximum supported memory speed may be lower when populating multiple DIMMs per channel on products that support multiple memory channels.
DDR4-2666
Max Memory Size
?
Max memory size refers to the maximum memory capacity supported by the processor.
128GB
Memory Channels
?
The number of memory channels refers to the bandwidth operation for real world application.
4
Max Memory Bandwidth
?
Max Memory bandwidth is the maximum rate at which data can be read from or stored into a semiconductor memory by the processor (in GB/s).
85 GB/s
ECC Memory Support
No

GPU Specifications

Integrated Graphics Model
?
An integrated GPU refers to the graphics core that is integrated into the CPU processor. Leveraging the processor's powerful computational capabilities and intelligent power efficiency management, it delivers outstanding graphics performance and a smooth application experience at a lower power consumption.
N/A

Miscellaneous

Extended Instruction Set
SSE4.1, SSE4.2, AVX-2, AVX-512
PCIe Lanes
44

Benchmarks

Cinebench R23
Single Core Score
1206
Cinebench R23
Multi Core Score
15066
Geekbench 6
Single Core Score
1328
Geekbench 6
Multi Core Score
9787
Geekbench 5
Single Core Score
1189
Geekbench 5
Multi Core Score
14374
Passmark CPU
Single Core Score
2635
Passmark CPU
Multi Core Score
28065

Compared to Other CPU

Cinebench R23 Single Core
1772 +46.9%
1545 +28.1%
1260 +4.5%
201 -83.3%
Cinebench R23 Multi Core
45651 +203%
18920 +25.6%
11391 -24.4%
6561 -56.5%
Geekbench 6 Single Core
1410 +6.2%
1370 +3.2%
1284 -3.3%
1249 -5.9%
Geekbench 6 Multi Core
11390 +16.4%
10606 +8.4%
9261 -5.4%
8729 -10.8%
Geekbench 5 Single Core
1267 +6.6%
1224 +2.9%
1158 -2.6%
1126 -5.3%
Geekbench 5 Multi Core
19253 +33.9%
12980 -9.7%
11909 -17.1%
Passmark CPU Single Core
2704 +2.6%
2674 +1.5%
2589 -1.7%
2553 -3.1%
Passmark CPU Multi Core
31632 +12.7%
29805 +6.2%
26864 -4.3%
25650 -8.6%