CPU Comparison
Intel Core i7-7800X vs Intel Core i7-7820X X-series
A side-by-side comparison of specs, performance and value. The Intel Core i7-7800X is a 6-core, 12-thread high-end desktop processor from the Skylake-X family, delivering quad-channel DDR4 memory and 28 PCIe 3.0 lanes via the LGA2066 socket, aimed at enthusiasts and workstation-class workloads.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Gaming
Virtualization
Efficiency
Specialized Performance
AI / ML
- AVX-512 accelerates some inference workloads on CPU
- No dedicated NPU or matrix engines
- Suitable only for light or experimental AI workloads
- No dedicated AI acceleration hardware
- AVX-512 can help certain CPU-bound inference tasks
- Most modern AI workloads are better served by GPUs
Content Creation
Gaming
- Supports high-refresh gaming with capable GPUs
- Lacks the single-thread uplift of newer architectures
- Requires discrete graphics
- 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
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- Quad-channel DDR4 memory
- Unlocked for overclocking
- AVX-512 support
- 12 threads for multi-threaded workloads
- 28 PCIe 3.0 lanes from CPU
Cons
- No integrated graphics
- Higher power consumption relative to modern CPUs
- Only 28 PCIe lanes vs higher-tier X-series SKUs
- Discontinued platform with limited upgrade path
- Memory officially limited to DDR4-2400
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
Competitors & Alternatives
Intel Core i7-7800X
- AMD Ryzen 7 1700Rival
Creator
- AMD Ryzen 7 1800XRival
Creator
- AMD Ryzen Threadripper 1920XRival
Workstation
- AMD Ryzen Threadripper 1950XRival
Workstation
- Intel Core i7-7820XRival
HEDT
- Intel Core i7-9700KAlt
Higher gaming performance on mainstream platform with lower power draw.
- AMD Ryzen 9 3900XAlt
More cores, higher efficiency, and newer platform with PCIe 4.0 support.
- Intel Core i9-9900KAlt
Strong single-thread performance suitable for gaming and productivity.
- AMD Ryzen 7 5800XAlt
Modern Zen 3 architecture with excellent single and multi-threaded performance.
- Intel Core i7-13700KAlt
Current-gen hybrid architecture with high core counts and PCIe 5.0.
Intel Core i7-7820X X-series
- AMD Ryzen 7 1800XRival
Creator/Gaming
- AMD Ryzen 7 1700XRival
Creator/Gaming
- AMD Ryzen Threadripper 1920XRival
Workstation
- AMD Ryzen Threadripper 1950XRival
Workstation
- Intel Core i9-7900XRival
HEDT
- Intel Core i7-14700KAlt
More cores, higher efficiency, and DDR5 on a modern mainstream platform.
- 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.
- Intel Core i7-13700KAlt
High-performance mainstream platform with good upgrade path.
- AMD Ryzen Threadripper 2950X (used)Alt
Higher core and lane count for workstation-class workloads.
Our Verdict on Each
The i7-7800X offers quad-channel memory and decent multi-core performance for its era, but higher power draw and limited PCIe lanes make it a niche choice today versus modern mainstream platforms.
Best for: Budget upgrade on existing X299 platform with DDR4 investment
Read the full reviewA 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 reviewFrequently Asked Questions
Which is better, Intel Core i7-7800X or Intel Core i7-7820X X-series?
Based on our editorial ratings, the Intel Core i7-7820X X-series 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 i7-7800X or Intel Core i7-7820X X-series?
For gaming, the Intel Core i7-7820X X-series leads with a gaming performance score of 78/100 among Intel Core i7-7800X and Intel Core i7-7820X X-series.
Do Intel Core i7-7800X and Intel Core i7-7820X X-series use the same socket?
Yes — all of these CPUs use the LGA2066 socket, so they share compatible motherboards.
Which has more cores?
The Intel Core i7-7820X X-series has the most cores. Core counts: Intel Core i7-7800X (6 cores), Intel Core i7-7820X X-series (8 cores).