CPU Comparison
Intel Core i7-9800X vs Intel Core i9-9940X
A side-by-side comparison of specs, performance and value. The Intel Core i7-9800X is an 8-core, 16-thread high-end desktop processor based on the Skylake-X refresh, designed for content creators and enthusiasts who need quad-channel memory and substantial PCIe connectivity on the LGA2066 platform.
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Strong multi-threaded performance for rendering, encoding, and other creator workloads, especially when lots of I/O is involved.
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
Capable of high-refresh-rate gaming at 1440p with a modern GPU, but newer mainstream 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
Good for running several VMs thanks to 8 cores, 16 threads and quad-channel memory, though platform is now aging.
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 result in notably higher power draw than modern 8-core alternatives 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 deep learning acceleration hardware.
- Suitable for CPU-based inference and light experimentation only.
- 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
- Strong single-core clocks up to 4.5 GHz help gaming performance.
- Quad-channel memory can benefit some CPU-limited titles.
- Modern gaming-optimized CPUs often surpass it in 1% low fps 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
- 8 cores and 16 threads handle multi-threaded workloads well
- 44 PCIe 3.0 lanes for multi-GPU and NVMe setups
- Quad-channel DDR4-2666 with 128 GB capacity
- Unlocked multiplier for flexible overclocking
- Solder TIM for improved thermals under load
- AVX-512 support for floating-point-intensive tasks
Cons
- High 165 W TDP and relatively low efficiency vs newer CPUs
- Older 14 nm process with no DDR5 or PCIe 4.0+
- No integrated graphics, requiring a discrete GPU
- Discontinued platform with limited long-term upgrade options
- Newer mainstream 8-core CPUs often match or beat it in gaming and efficiency
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 i7-9800X
- AMD Ryzen 7 2700XRival
Mainstream 8-core
- AMD Ryzen Threadripper 2920XRival
HEDT 12-core
- Intel Core i9-9900KRival
Mainstream 8-core Gaming
- Intel Core i7-7820XRival
Previous-gen HEDT 8-core
- AMD Ryzen 9 3900XRival
High-Performance 12-core
Same platform with two more cores and slightly better performance if you stay on X299.
Compare head-to-head- AMD Ryzen 9 7900Alt
Much more efficient modern platform with DDR5 and PCIe 5.0 if you are building new.
- Intel Core i7-14700KAlt
Far better gaming and efficiency on a mainstream platform with some creator workload capability.
- AMD Ryzen 9 5900XAlt
Strong multi-threaded performance with better efficiency and a more modern platform.
- AMD Ryzen Threadripper 2950XAlt
Much higher core count for heavily multi-threaded workstation workloads, though power is higher.
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 solid HEDT processor for users who need quad-channel memory and 44 PCIe lanes, but outclassed in efficiency and single-thread performance by newer mainstream and HEDT parts.
Best for: Used or discounted X299 workstation build where quad-channel memory and 44 PCIe lanes are critical and platform cost is 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 i7-9800X 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 i7-9800X (8 cores), Intel Core i9-9940X (14 cores).