CPU Comparison
Intel Core i9-9940X vs Intel Core i9-9990XE
A side-by-side comparison of specs, performance and value. The Intel Core i9-9940X is a 14‑core, 28‑thread high‑end desktop processor in Intel’s 9th Gen Core X‑Series (Skylake‑X) family, aimed at content creators and workstation users who need many cores, quad‑channel memory, and substantial PCIe connectivity without stepping up to the more expensive 16‑ or 18‑core SKUs.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
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.
Very strong multi-threaded performance for Adobe apps, rendering, and simulation workloads, competitive with or slightly ahead of the 18-core i9-9980XE in some tests.
Gaming
Still capable of high‑refresh‑rate gaming at 1440p and 4K, but modern mainstream and HEDT CPUs typically deliver better single‑thread and efficiency.
Capable of high-refresh-rate gaming thanks to strong single-core clocks, but modern gaming-focused CPUs often deliver better minimums and efficiency at far lower cost.
Virtualization
Excellent for running several VMs or containers thanks to 14 cores, quad‑channel memory, and ample PCIe lanes for passthrough.
Good for running several VMs thanks to 14 cores and quad-channel memory, but high power draw and lack of warranty are concerns for 24/7 use.
Efficiency
High 165 W TDP and 14 nm process make it significantly less efficient than 7 nm and 10 nm alternatives under mixed workloads.
Extremely low efficiency; 255 W TDP at base frequency and much higher real power draw under all-core boost makes it one of the most power-hungry HEDT CPUs of its era.
Specialized Performance
AI / ML
- 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.
- No dedicated AI or matrix hardware; AI workloads rely on AVX-512 and CPU-based inference.
- Suitable for small-scale CPU inference and prototyping, but not competitive with modern NPUs or GPUs.
Content Creation
Gaming
- 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.
- High clock speeds give strong single-threaded performance for high-refresh-rate gaming.
- 14 cores are underutilized in most games, which favor fewer faster cores.
- Modern gaming CPUs (e.g., 13th/14th Gen Core i9, Ryzen 7000) often deliver better gaming performance per watt and per dollar.
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
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.
Pros
- 14 cores and 28 threads with strong multi-threaded throughput
- Up to 5.1 GHz single-core and 5.0 GHz all-core turbo for its generation
- 44 PCIe 3.0 lanes for multi-GPU and storage expansion
- Quad-channel DDR4-2666 with support for up to 128 GB RAM
- Unlocked multiplier for enthusiast overclocking
- Highly binned silicon with STIM for improved thermal transfer
Cons
- Extremely high 255 W TDP and real-world power draw far above that under load
- No warranty from Intel and no guaranteed availability
- Auction-only distribution makes it virtually unobtainable for normal users
- Old 14 nm process and platform with no upgrade path beyond X299
- Outperformed by newer CPUs in efficiency and often in raw performance per dollar
Competitors & Alternatives
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.
Intel Core i9-9990XE
- Compare head-to-headIntel Core i9-9980XERival
HEDT / Workstation
- Compare head-to-headIntel Core i9-9940XRival
HEDT / Workstation
- AMD Ryzen Threadripper 2920XRival
HEDT / Workstation
- AMD Ryzen Threadripper 2950XRival
HEDT / Workstation
- Intel Xeon W-3175XRival
Workstation
Newer 18-core Cascade Lake-X CPU with better pricing, better efficiency, and a more standard distribution model.
Compare head-to-head- AMD Ryzen 9 7900Alt
Modern 12-core AM5 CPU with much higher efficiency, DDR5, and strong gaming and creator performance at a lower price point.
Hybrid architecture with excellent gaming and creator performance, far better efficiency, and a mainstream platform with long-term support.
Compare head-to-head- AMD Ryzen Threadripper 3960XAlt
24-core HEDT CPU with quad-channel memory and more PCIe lanes, offering significantly more multi-threaded headroom for similar money.
Our Verdict on Each
A 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 reviewAn extraordinarily fast but impractical CPU: stellar clocks and multi-threaded performance for its era, but extreme power draw, no warranty, and near-zero availability make it a collector’s item rather than a practical purchase.
Best for: Boutique workstation integrator with existing X299 inventory and a specific need for the highest possible clocks on 14 cores, regardless of cost or warranty.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i9-9940X or Intel Core i9-9990XE?
Based on our editorial ratings, the Intel Core i9-9940X comes out ahead with a score of 8/10. That said, the best choice depends on your workload — check the spec and performance breakdown above for gaming, productivity and efficiency differences.
Which is faster for gaming, Intel Core i9-9940X or Intel Core i9-9990XE?
For gaming, the Intel Core i9-9990XE leads with a gaming performance score of 81/100 among Intel Core i9-9940X and Intel Core i9-9990XE.
Which uses less power?
The Intel Core i9-9940X has the lowest rated TDP. Power draw across these chips: Intel Core i9-9940X (165 W), Intel Core i9-9990XE (255 W).
Do Intel Core i9-9940X and Intel Core i9-9990XE use the same socket?
No. They use different sockets (Intel Core i9-9940X: FCLGA2066, Intel Core i9-9990XE: LGA2066), so each needs a compatible motherboard.
Which is faster in multi-core benchmarks?
The Intel Core i9-9990XE posts the highest multi-core benchmark score. Multi-core results: Intel Core i9-9990XE (23,600). Benchmark figures are approximate and workload-dependent.