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 a high-end desktop (HEDT) processor launched in October 2018 as part of the 9th Generation X-Series lineup. Built on the Skylake-X microarchitecture and utilizing Intel's 14nm process, this processor is designed for enthusiasts, content creators, and professionals requiring immense multi-threaded performance. It features 8 physical cores and supports 16 threads via Hyper-Threading. Operating at a base clock of 3.8 GHz and boosting up to 4.5 GHz, it delivers strong single-core responsiveness alongside its multi-core prowess. A standout feature is its 44 PCIe 3.0 lanes, enabling massive expansion capabilities for multiple GPUs and high-speed NVMe storage arrays. It also supports quad-channel DDR4 memory, providing exceptional memory bandwidth. Unlike mainstream desktop chips, the i7-9800X lacks integrated graphics, requiring a dedicated GPU. With a 165W TDP, it demands robust cooling and power delivery. It remains a capable workstation chip for users needing extensive I/O and parallel processing power.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Excellent multi-core performance for creator applications and heavy multitasking.
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
Good gaming performance, though newer mainstream CPUs often outperform it in single-core.
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
44 PCIe lanes and 16 threads make it ideal for complex virtualization setups.
Excellent for running several VMs or containers thanks to 14 cores, quad‑channel memory, and ample PCIe lanes for passthrough.
Efficiency
165W TDP and 14nm process result in high power consumption and heat.
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
- AVX-512 instructions accelerate certain AI workloads
- High core count aids CPU-based inference
- 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 frequency for gaming
- PCIe lanes allow for multiple GPUs
- Not the best choice for purely gaming due to HEDT latency
- 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
- 44 PCIe 3.0 lanes
- Quad-channel memory support
- Unlocked for overclocking
- Strong multi-threaded performance
Cons
- High 165W TDP
- 14nm process is inefficient
- No integrated graphics
- Expensive platform (X299)
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
Desktop
- AMD Threadripper 2920XRival
High-End Desktop
- Compare head-to-headIntel Core i7-7820XRival
High-End Desktop
- AMD Ryzen 9 3900XRival
Desktop
- Compare head-to-headIntel Core i9-7900XRival
High-End Desktop
10th Gen refresh with slightly better performance and thermals.
Compare head-to-head- AMD Ryzen 9 5950XAlt
Vastly superior efficiency and multi-core performance on a modern platform.
Modern mainstream CPU that outperforms it in almost every metric.
Compare head-to-head- AMD Threadripper 3960XAlt
Much higher core count for professional HEDT workloads.
Better gaming performance and efficiency at a lower price.
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
Newer hybrid architecture with similar or better multi‑thread performance and far better efficiency for a new build.
Compare head-to-head- 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 powerful HEDT processor offering excellent PCIe expansion and quad-channel memory, though its high TDP and older 14nm process make it less efficient than modern alternatives.
Best for: If you are considering the Intel Core i7-9800X today, it should strictly be viewed as a budget option for a used workstation build. Its 8 cores, 44 PCIe lanes, and quad-channel memory support make it highly capable for 3D rendering, complex virtualization, and heavy multitasking. However, the 165W TDP means you will need a robust power supply and high-end cooling solution. Avoid this processor if your primary goal is gaming, as mainstream CPUs offer better single-core performance and efficiency at a lower price point. It is best suited for creators who need massive PCIe expansion on a budget and are comfortable building on a refurbished X299 platform. For new builds, modern platforms offer significantly better performance per watt.
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
Which is faster for gaming, Intel Core i7-9800X or Intel Core i9-9940X?
For gaming, the Intel Core i7-9800X leads with a gaming performance score of 80/100 among Intel Core i7-9800X and Intel Core i9-9940X.
Do Intel Core i7-9800X and Intel Core i9-9940X use the same socket?
No. They use different sockets (Intel Core i7-9800X: Intel Socket 2066, Intel Core i9-9940X: FCLGA2066), so each needs a compatible motherboard.
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).