CPU Comparison
Intel Core i7-3960X Processor vs Intel Core i7-7820X
A side-by-side comparison of specs, performance and value. The Intel Core i7-3960X is a six-core Extreme Edition processor for LGA2011, launched in late 2011 as the flagship of Intel's Sandy Bridge-E HEDT platform.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
Six cores and Hyper-Threading help in older workloads, though newer CPUs complete multi-threaded tasks much faster and more efficiently.
Strong multi-threaded throughput in CINEBENCH, HandBrake, and similar workloads at launch; still competent for many content creation tasks compared to modern mainstream parts.
Gaming
Playable in many titles at 1080p with a strong GPU, but frame rates and 1% lows fall behind modern processors.
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.
Virtualization
Quad-channel memory and 12 threads suit lab or VM setups on legacy hardware.
PCIe and memory bandwidth are helpful for multiple VMs, but core count is moderate for modern heavy virtualization needs.
Efficiency
High power draw relative to performance makes it inefficient by today's standards.
High 140 W TDP and 14 nm process lead to greater power consumption versus newer 7 nm and smaller nodes.
Specialized Performance
AI / ML
- No dedicated AI acceleration hardware
- Can run basic CPU-based inference, but impractical for modern ML 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
- Requires strong GPU to mitigate CPU bottlenecks in newer titles
- High-refresh gaming is generally unrealistic
- DDR3 quad-channel does not compensate for low per-core performance
- 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
- Six cores and 12 threads offered strong multi-threaded performance in 2011
- Quad-channel DDR3 memory controller
- 40 PCIe lanes from the CPU
- Unlocked multiplier for overclocking
- Still viable for certain legacy workstation workloads
Cons
- No integrated graphics (requires discrete GPU)
- High power consumption for the performance delivered today
- DDR3 limits memory bandwidth compared to DDR4/DDR5 platforms
- PCIe 2.0 instead of 3.0/4.0
- Discontinued platform with limited future upgrade options
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 i7-3960X Processor
- AMD FX-8150Rival
Enthusiast Desktop
- AMD FX-8350Rival
Enthusiast Desktop
- Intel Core i7-3930KRival
High-End Desktop
- Compare head-to-headIntel Core i7-990XRival
High-End Desktop
- Intel Core i7-4960XAlt
Same LGA2011 platform, higher clocks and Ivy Bridge-E improvements if found used.
Haswell-E HEDT with DDR4 and more PCIe lanes; requires LGA2011-v3 board.
Compare head-to-head- AMD Ryzen 7 5700XAlt
Modern DDR4 platform with far better efficiency and performance.
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.
Our Verdict on Each
A powerful HEDT chip in its time, the i7-3960X still delivers capable multi-threaded performance for legacy workstations, but it lags far behind modern CPUs in efficiency and per-core speed.
Best for: Upgrading an existing LGA2011 system on a minimal budget to extend its life for specific workloads.
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 faster for gaming, Intel Core i7-3960X Processor or Intel Core i7-7820X?
For gaming, the Intel Core i7-7820X leads with a gaming performance score of 78/100 among Intel Core i7-3960X Processor and Intel Core i7-7820X.
Which uses less power?
The Intel Core i7-3960X Processor has the lowest rated TDP. Power draw across these chips: Intel Core i7-3960X Processor (130 W), Intel Core i7-7820X (140 W).
Do Intel Core i7-3960X Processor and Intel Core i7-7820X use the same socket?
No. They use different sockets (Intel Core i7-3960X Processor: LGA2011 (FCLGA2011), Intel Core i7-7820X: LGA2066), so each needs a compatible motherboard.
Which has more cores?
The Intel Core i7-7820X has the most cores. Core counts: Intel Core i7-3960X Processor (6 cores), Intel Core i7-7820X (8 cores).