CPU Comparison
Intel Core i7-7820X vs Intel Core i9-7920X
A side-by-side comparison of specs, performance and value. The Intel Core i7-7820X is an 8-core, 16-thread high-end desktop processor on the X299 platform, offering quad-channel DDR4-2666, 28 PCIe 3.0 lanes, and AVX-512 support for workstation and creator workloads.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Strong multi-threaded throughput in CINEBENCH, HandBrake, and similar workloads at launch; still competent for many content creation tasks compared to modern mainstream parts.
Strong multi-threaded performance for its era; still usable for rendering and encoding if power and platform age are acceptable.
Gaming
Delivers high frame rates in 2017-era titles and remains adequate for modern gaming, but newer gaming-focused CPUs with higher clocks and improved IPC pull ahead.
Acceptable frame rates in many titles, but modern gaming CPUs with higher clocks and newer architectures will outpace it.
Virtualization
PCIe and memory bandwidth are helpful for multiple VMs, but core count is moderate for modern heavy virtualization needs.
Plenty of cores, threads, and PCIe lanes make it a solid choice for multiple VMs and storage devices.
Efficiency
High 140 W TDP and 14 nm process lead to greater power consumption versus newer 7 nm and smaller nodes.
At 14 nm and 140 W base TDP, the 7920X draws significantly more power per unit of performance than newer parts.
Specialized Performance
AI / ML
- No dedicated AI acceleration hardware
- AVX-512 can help certain CPU-bound inference tasks
- Most modern AI workloads are better served by GPUs
- No dedicated AI accelerators; AI workloads rely on AVX-512 and general-purpose compute.
- Useful for small-scale inference prototyping or running traditional ML workloads on CPU.
Content Creation
Gaming
- Capable of high-refresh gaming with a strong GPU
- Single-core boost reaches up to 4.5 GHz on favored cores
- Modern CPUs offer better gaming efficiency and higher IPC
- Single-core Turbo Boost Max 3.0 up to 4.4 GHz helps in CPU-limited titles.
- Lacks the high clocks and IPC gains of newer CPUs, so GPU-heavy games at high resolutions are the best fit.
- PCIe 3.0 is adequate for current GPUs, though Gen4/Gen5 offer more headroom for fast NVMe and future cards.
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- 8 cores and 16 threads for multi-threaded workloads
- Quad-channel DDR4 memory increases bandwidth
- 28 PCIe 3.0 lanes plus chipset lanes for expansion
- Turbo Boost Max 3.0 for higher single-core boosts
- AVX-512 support for optimized workloads
- Unlocked multiplier for overclocking
Cons
- High 140 W TDP and power consumption
- No integrated graphics
- Only 28 CPU PCIe lanes, limiting multi-GPU configurations
- Discontinued platform with limited future upgrades
- Older 14 nm process versus modern smaller nodes
Pros
- 12 cores and 24 threads for heavily threaded workloads.
- 44 PCIe 3.0 lanes for multi-GPU and NVMe configurations.
- Quad-channel DDR4-2666 with up to 128 GB capacity.
- AVX-512 support with 2 FMA units for vectorized compute.
- Unlocked multiplier for enthusiast tuning.
Cons
- Discontinued platform with no upgrade path beyond Cascade Lake-X refresh.
- Higher power consumption and heat compared to newer architectures.
- Base clock is modest at 2.9 GHz; all-core boost is 4.3 GHz.
- No integrated graphics; requires a discrete GPU.
- Lacks modern platform features (DDR5, PCIe 4.0+).
Competitors & Alternatives
Intel Core i7-7820X
- AMD Ryzen 7 1800XRival
Creator/Gaming
- AMD Ryzen 7 1700XRival
Creator/Gaming
- AMD Ryzen Threadripper 1920XRival
Workstation
- AMD Ryzen Threadripper 1950XRival
Workstation
- RivalCompare head-to-head
More cores, higher efficiency, and DDR5 on a modern mainstream platform.
Compare head-to-head- AMD Ryzen 9 7900Alt
Strong multi-threaded performance with excellent efficiency.
- AMD Ryzen 9 5900XAlt
12-core AM4 option with strong gaming and creator performance.
High-performance mainstream platform with good upgrade path.
Compare head-to-head- AMD Ryzen Threadripper 2950X (used)Alt
Higher core and lane count for workstation-class workloads.
Intel Core i9-7920X
- AMD Ryzen Threadripper 1920XRival
HEDT
- AMD Ryzen 9 5900XRival
Mainstream Enthusiast
- Compare head-to-headAMD Ryzen 9 7900XRival
Mainstream Enthusiast
- RivalCompare head-to-head
- Compare head-to-headIntel Core i7-14700KRival
Mainstream Enthusiast
Our Verdict on Each
A competent eight-core HEDT chip with strong multi-threaded performance and platform expansion, though high power draw and limited PCIe lanes compared to higher-tier X299 CPUs make it a niche choice today.
Best for: Used-market upgrade for an existing X299 build with quad-channel DDR4 and a need for more cores than mainstream.
Read the full reviewA capable 12-core HEDT chip with strong multi-threaded throughput and excellent I/O, but high power draw, an aging platform, and discontinued status make it relevant mainly for used-market upgrades or extending existing X299 builds.
Best for: Upgrading an existing X299 system at low cost (used CPU) to gain cores and PCIe lanes without replacing motherboard and memory.
Read the full reviewFrequently Asked Questions
Which is better, Intel Core i7-7820X or Intel Core i9-7920X?
Based on our editorial ratings, the Intel Core i7-7820X comes out ahead with a score of 7.5/10. 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 i7-7820X or Intel Core i9-7920X?
For gaming, the Intel Core i7-7820X leads with a gaming performance score of 78/100 among Intel Core i7-7820X and Intel Core i9-7920X.
Do Intel Core i7-7820X and Intel Core i9-7920X use the same socket?
No. They use different sockets (Intel Core i7-7820X: LGA2066, Intel Core i9-7920X: LGA2066 (FCLGA2066)), so each needs a compatible motherboard.
Which has more cores?
The Intel Core i9-7920X has the most cores. Core counts: Intel Core i7-7820X (8 cores), Intel Core i9-7920X (12 cores).