CPU Comparison
Intel Core i9-9920X vs Intel Core i9-9940X
A side-by-side comparison of specs, performance and value. The Intel Core i9-9920X is a 12-core, 24-thread high-end desktop processor built on the Skylake-X architecture for the LGA2066 X299 platform, designed for content creators and workstation users who need many PCIe lanes and quad-channel memory alongside strong multi-threaded performance.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Gaming
Virtualization
Efficiency
Specialized Performance
AI / ML
- No dedicated AI or matrix hardware beyond AVX-512.
- Can handle CPU-based inference for small models, but is outclassed by modern NPUs and GPUs for serious AI workloads.
- No dedicated AI accelerators; relies on AVX‑512 CPU inference.
- Acceptable for light CPU‑based inference or prototyping, but not competitive with modern CPUs or GPUs with DL Boost / Tensor cores.
Content Creation
Gaming
- High single-core boost (4.4/4.5 GHz) keeps frame rates high in CPU-heavy titles.
- Quad-channel memory can help in some CPU-limited scenarios.
- Modern 6–8 core mainstream CPUs often match or beat it in gaming while using less power.
- Best paired with a high-end GPU for balanced system; GPU bottlenecks are more likely at 4K.
- Strong single‑core clocks up to 4.4 GHz with Turbo Boost Max 3.0 up to 4.5 GHz on favored cores.
- Capable of 144 fps+ esports performance at 1080p with a modern GPU; more GPU‑bound at 1440p and 4K.
- Modern 6–8 core CPUs often match or beat it in games while drawing far less power.
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- 12 cores and 24 threads for heavily threaded workloads.
- 44 PCIe 3.0 lanes for multi-GPU and fast storage.
- Quad-channel DDR4-2666 with up to 128 GB official support.
- AVX-512 support for specialized vectorized workloads.
- Unlocked multiplier for overclocking on X299.
- Strong multi-threaded performance for its era.
Cons
- High 165 W TDP and real-world power draw under load.
- 14 nm Skylake-X is less efficient than modern architectures.
- No integrated graphics; discrete GPU required.
- X299 platform is discontinued with no upgrade path beyond Cascade Lake-X.
- Newer CPUs (Ryzen 9 3900X, 12th+ gen Intel) often offer better performance per watt and per dollar.
Pros
- 14 cores and 28 threads for heavily threaded workloads.
- 44 PCIe 3.0 lanes for multi‑GPU and NVMe setups.
- Quad‑channel DDR4‑2666 with up to 128 GB support.
- AVX‑512 instruction support for specialized compute.
- Unlocked multiplier for enthusiast overclocking.
Cons
- High 165 W TDP and relatively low efficiency vs newer CPUs.
- Older 14 nm Skylake‑X platform with no upgrade path beyond Cascade Lake‑X.
- No integrated graphics; requires a discrete GPU.
- Only 44 PCIe lanes versus 64 on competing Threadripper platforms.
- Discontinued, with limited long‑term platform support.
Competitors & Alternatives
Intel Core i9-9920X
- AMD Ryzen Threadripper 2920XRival
HEDT / Workstation
- AMD Ryzen 9 3900XRival
High-End Desktop
- Compare head-to-headIntel Core i9-10920XRival
HEDT / Workstation
- Intel Core i9-7900XRival
HEDT / Workstation
- Compare head-to-headIntel Core i9-9980XERival
HEDT / Workstation
- Intel Core i7-14700KAlt
Much faster for gaming and lightly threaded tasks, with far better efficiency and a modern platform.
- AMD Ryzen 9 7900Alt
Modern 12C/24T Zen 4 CPU with DDR5, PCIe 5.0, and significantly lower power draw.
Higher performance in both gaming and productivity with a newer feature set, though also high power.
Compare head-to-head
Intel Core i9-9940X
- AMD Ryzen Threadripper 2920XRival
HEDT / Workstation
- AMD Ryzen Threadripper 2970WXRival
HEDT / Many‑Core Workstation
- AMD Ryzen 9 3900XRival
High‑End Mainstream / Creator
- Compare head-to-headIntel Core i9-10940XRival
HEDT (Cascade Lake‑X)
- Compare head-to-headIntel Core i9-7940XRival
Previous‑Gen HEDT
- Intel Core i7-14700KAlt
Newer hybrid architecture with similar or better multi‑thread performance and far better efficiency for a new build.
- AMD Ryzen 9 7900Alt
Modern AM5 platform with DDR5 and PCIe 5.0, much better efficiency, and strong creator performance.
Our Verdict on Each
A capable HEDT CPU with excellent multi-threaded performance and expansive I/O, but high power consumption and an aging platform make it primarily interesting for used workstation builds rather than new systems.
Best for: Used workstation or HEDT build where X299, quad-channel memory, and many PCIe lanes are requirements, and a modern platform upgrade is not feasible.
Read the full reviewA capable HEDT CPU with strong multi‑threaded performance and excellent I/O, but outclassed in efficiency and value by newer mainstream and HEDT alternatives.
Best for: Used or discounted X299 workstation builds where you need many cores and PCIe lanes on a budget.
Read the full reviewFrequently Asked Questions
Do Intel Core i9-9920X and Intel Core i9-9940X use the same socket?
Yes — all of these CPUs use the FCLGA2066 socket, so they share compatible motherboards.
Which has more cores?
The Intel Core i9-9940X has the most cores. Core counts: Intel Core i9-9920X (12 cores), Intel Core i9-9940X (14 cores).