CPU Comparison
Intel Core i9-9820X vs Intel Core i9-9940X
A side-by-side comparison of specs, performance and value. The Intel Core i9-9820X is a 10-core, 20-thread high-end desktop processor from Intel’s 9th Gen Core X-Series (Skylake-X refresh), aimed at content creators and enthusiasts who need more PCIe lanes and quad‑channel memory than mainstream desktop platforms provide.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Strong multi‑threaded performance in content creation workloads, though 12‑ and 14‑core X‑Series parts and newer Ryzen 9/Threadripper models pull ahead in heavily parallel tasks.
Strong multi‑threaded performance for rendering and encoding, though newer 12–16 core mainstream and HEDT chips often match or beat it while using less power.
Gaming
Still capable for 60+ FPS in most modern titles at high settings, but newer mainstream and HEDT CPUs often deliver better minimums and efficiency.
Still capable of high‑refresh‑rate gaming at 1440p and 4K, but modern mainstream and HEDT CPUs typically deliver better single‑thread and efficiency.
Virtualization
Excellent for running several VMs simultaneously thanks to 10 cores and quad‑channel memory, but platform is now end‑of‑life with no upgrade path beyond LGA2066.
Excellent for running several VMs or containers thanks to 14 cores, quad‑channel memory, and ample PCIe lanes for passthrough.
Efficiency
High 165 W TDP and 14 nm process mean significantly more power draw than modern 10‑core designs for similar or better performance.
High 165 W TDP and 14 nm process make it significantly less efficient than 7 nm and 10 nm alternatives under mixed workloads.
Specialized Performance
AI / ML
- No dedicated AI or matrix acceleration hardware.
- Can handle CPU‑based inference and small models, but not competitive with modern NPUs or 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
- Solid 60+ FPS experience in most AAA games at 1440p with a modern GPU.
- High single‑core boost helps with CPU‑bound titles and high‑refresh gaming.
- Newer mainstream and HEDT CPUs often deliver better 1% lows and efficiency.
- 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
- 10 cores and 20 threads for multi‑threaded workloads.
- 44 PCIe 3.0 lanes for multi‑GPU and NVMe arrays.
- Quad‑channel DDR4‑2666 up to 128 GB.
- Unlocked multiplier with granular overclocking controls.
- Turbo Boost Max 3.0 favors best cores for lightly‑threaded tasks.
- Good used‑market value for I/O‑heavy builds.
Cons
- High 165 W TDP and relatively low efficiency versus modern CPUs.
- 14 nm process shows its age in power and clock scaling.
- No integrated graphics; discrete GPU required.
- Discontinued platform with no upgrade path beyond LGA2066/X299.
- Newer mainstream and HEDT CPUs often outperform it per dollar and per watt.
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 i9-9820X
- AMD Ryzen Threadripper 1950XRival
HEDT
- AMD Ryzen Threadripper 2920XRival
HEDT
- RivalCompare head-to-head
- RivalCompare head-to-head
- AMD Ryzen 9 3900XRival
High-End Desktop
Same LGA2066 platform with 12 cores and slightly better multi‑threaded performance if you’re already on X299.
Compare head-to-head- AMD Ryzen Threadripper 2950XAlt
Much higher core count and memory bandwidth for serious workstation use, though more expensive and power‑hungry.
Better gaming and single‑thread performance on a mainstream platform, but fewer PCIe lanes and memory channels.
Compare head-to-head- Intel Core i7-14700KAlt
Modern hybrid architecture with strong gaming and creator performance, but again with fewer I/O lanes than X299.
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 10‑core HEDT processor with strong I/O and multi‑threaded performance, but outclassed in efficiency and value by newer mainstream and HEDT platforms.
Best for: Used or clearance HEDT builds where 44 PCIe lanes and quad‑channel memory are critical and platform cost is very low.
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 i9-9820X 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 i9-9820X (10 cores), Intel Core i9-9940X (14 cores).