CPU Comparison
Intel Core i9-7900X vs Intel Core i9-9900X
A side-by-side comparison of specs, performance and value. The Intel Core i9-7900X is a 10-core, 20-thread high-end desktop processor based on the Skylake-X architecture, targeting enthusiasts, content creators, and workstation users who need more cores, memory bandwidth, and PCIe lanes than mainstream desktop platforms offer.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Strong multi-threaded performance for creator workloads; competitive with or better than many mainstream 8–10 core CPUs at the time, though newer designs are faster per clock.
Strong multi-threaded performance for rendering, compilation, and content creation, though newer 10–12 core desktop CPUs deliver better efficiency.
Gaming
Capable of high-refresh-rate gaming at 1440p and above, but modern gaming-focused CPUs often deliver better minimums and efficiency.
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.
Virtualization
Excellent for running multiple VMs thanks to 10 cores, 20 threads, and quad-channel memory, especially when paired with VT-x and VT-d support.
Excellent for running multiple VMs thanks to 10 cores, quad-channel memory, and VT-x/VT-d support.
Efficiency
High power consumption and heat output compared to modern 10nm/7nm parts; requires robust cooling and a strong PSU.
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.
Specialized Performance
AI / ML
- No dedicated AI acceleration hardware like NPU or AI instructions beyond AVX-512.
- Suitable for CPU-based inference and small model workloads, but not competitive with modern AI-focused CPUs or GPUs.
- No dedicated AI or matrix hardware acceleration.
- Suitable only for CPU-based inference and light ML workloads.
Content Creation
Gaming
- Strong single-core clocks up to 4.3–4.5 GHz enable high FPS in CPU-heavy titles.
- Most games don’t scale beyond 6–8 cores, so newer 8-core CPUs often match or beat it in gaming while using less power.
- Best suited for GPU-bound scenarios at 1440p/4K where the CPU is less of a bottleneck.
- 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.
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- 10 cores and 20 threads for heavy multi-threaded workloads.
- 44 PCIe 3.0 lanes from the CPU for multi-GPU and NVMe SSDs.
- Quad-channel DDR4-2666 with up to 85 GB/s bandwidth.
- Strong performance for content creation and virtualization at its price point.
- Unlocked multiplier for enthusiast overclocking.
- Turbo Boost Max 3.0 boosts up to 4.5 GHz on best cores.
Cons
- High 140W TDP and real-world power draw under load.
- 14nm process is significantly less efficient than modern 10nm/7nm designs.
- No integrated graphics; requires a discrete GPU.
- X299 platform is discontinued with no upgrade path beyond LGA2066.
- Mesh interconnect can increase lightly-threaded latency versus older ring-bus designs in some workloads.
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.
Competitors & Alternatives
Intel Core i9-7900X
- AMD Ryzen Threadripper 1900XRival
High-End Desktop / Workstation
- AMD Ryzen 7 1800XRival
Mainstream High-End Desktop
- Compare head-to-headIntel Core i7-6950XRival
Previous-Gen HEDT
- Intel Core i9-7820XRival
8-Core HEDT Alternative
- Compare head-to-headIntel Core i9-7960XRival
Higher-Core-Count HEDT
Same platform with higher clocks and slightly better efficiency; better choice if staying on X299.
Compare head-to-head- AMD Ryzen 9 3900XAlt
Newer 12-core AM4 part with much better efficiency and strong creator performance; requires a new platform.
Modern 20-thread mainstream CPU with much better single-threaded and gaming performance, plus DDR5 support.
Compare head-to-head- AMD Ryzen 9 7900Alt
Efficient 12-core AM5 CPU with modern I/O (DDR5, PCIe 5.0) and far better power efficiency.
Later 12-core X-Series part on the same X299 platform if you want more cores but stay on LGA2066.
Compare head-to-head
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
Our Verdict on Each
A once-flagship HEDT CPU that still delivers strong multi-threaded performance and I/O capability, but its 14nm process, high power draw, and discontinued platform make it mainly interesting for used builds or legacy systems.
Best for: Used workstation or creator build on X299 where multi-threaded performance and I/O matter more than efficiency or platform longevity.
Read the full reviewA 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 reviewFrequently Asked Questions
Which uses less power?
The Intel Core i9-7900X has the lowest rated TDP. Power draw across these chips: Intel Core i9-7900X (140 W), Intel Core i9-9900X (165 W).
Do Intel Core i9-7900X and Intel Core i9-9900X use the same socket?
No. They use different sockets (Intel Core i9-7900X: LGA2066, Intel Core i9-9900X: FCLGA2066), so each needs a compatible motherboard.
Which is faster in multi-core benchmarks?
The Intel Core i9-7900X posts the highest multi-core benchmark score. Multi-core results: Intel Core i9-7900X (10,199). Benchmark figures are approximate and workload-dependent.