CPU Comparison
Intel Core i9-9900X vs Intel Core i9-9990XE
A side-by-side comparison of specs, performance and value. The Intel Core i9-9900X is a 10-core, 20-thread high-end desktop processor built on the Skylake-X architecture for Intel’s X-Series HEDT platform, offering quad-channel DDR4-2666 memory and 44 PCIe 3.0 lanes for workstations and content creators.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Strong multi-threaded performance for rendering, compilation, and content creation, though newer 10–12 core desktop CPUs deliver better efficiency.
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
Smooth for high-refresh 1080p and 1440p gaming, but modern mainstream CPUs often match or beat it in lightly-threaded titles while using far less power.
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 multiple VMs thanks to 10 cores, quad-channel memory, and VT-x/VT-d support.
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 14nm process result in notably higher power draw and heat compared to 7nm and 5nm era desktop and HEDT CPUs.
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 or matrix hardware acceleration.
- Suitable only for CPU-based inference and light ML workloads.
- 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
- Capable of 1080p high-refresh and 1440p gaming with a modern GPU.
- Single-core performance is competitive but not class-leading versus newer mainstream CPUs.
- PCIe 3.0 x16 is sufficient for current GPUs, but PCIe 4.0/5.0 offer more headroom on newer platforms.
- 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
- 10 cores and 20 threads for multi-threaded workloads.
- 44 PCIe 3.0 lanes for multi-GPU and fast storage.
- Quad-channel DDR4-2666 with 128 GB capacity support.
- Unlocked multiplier for enthusiast overclocking.
- AVX-512 support for specialized floating-point and vector workloads.
Cons
- High 165 W TDP and 14nm process make it inefficient versus modern CPUs.
- No integrated graphics; discrete GPU required.
- Discontinued platform with limited long-term BIOS and support outlook.
- LGA2066 ecosystem is more expensive and less mainstream than LGA1700/AM5.
- Memory speed capped at DDR4-2666 officially.
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 i9-9900X
- AMD Ryzen Threadripper 2920XRival
HEDT
- RivalCompare head-to-head
- AMD Ryzen 9 3900XRival
High-End Desktop
- RivalCompare head-to-head
- Compare head-to-headIntel Core i9-9900KRival
Mainstream High-End
Much better gaming and efficiency, with a longer platform lifespan.
Compare head-to-headHybrid architecture with stronger single-thread and gaming performance plus DDR4/DDR5 flexibility.
Compare head-to-head
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 still-capable HEDT CPU for used builds needing PCIe lanes and memory channels, but outclassed in efficiency and value by newer mainstream and HEDT platforms.
Best for: Used or clearance LGA2066 workstation build where you explicitly need 44 PCIe lanes and quad-channel memory on a tight 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 i9-9900X or Intel Core i9-9990XE?
Based on our editorial ratings, the Intel Core i9-9900X 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 i9-9900X or Intel Core i9-9990XE?
For gaming, the Intel Core i9-9990XE leads with a gaming performance score of 81/100 among Intel Core i9-9900X and Intel Core i9-9990XE.
Which uses less power?
The Intel Core i9-9900X has the lowest rated TDP. Power draw across these chips: Intel Core i9-9900X (165 W), Intel Core i9-9990XE (255 W).
Do Intel Core i9-9900X and Intel Core i9-9990XE use the same socket?
No. They use different sockets (Intel Core i9-9900X: FCLGA2066, Intel Core i9-9990XE: LGA2066), so each needs a compatible motherboard.
Which has more cores?
The Intel Core i9-9990XE has the most cores. Core counts: Intel Core i9-9900X (10 cores), Intel Core i9-9990XE (14 cores).
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.