CPU Comparison
Core i7-3910K vs Intel Core i7-5820K
A side-by-side comparison of specs, performance and value. The Intel Core i7-3910K is a 6-core, 12-thread high-end desktop processor built on the Sandy Bridge-E architecture. Released in mid-2013 as a budget entry to the LGA 2011 platform, it features a base clock of 3.0 GHz and a turbo boost of 3.6 GHz. Manufactured on a 32nm process, it packs 2.27 billion transistors into a large 435mm² die. It supports quad-channel DDR3 memory and 40 PCIe 3.0 lanes, making it highly capable for multi-GPU and storage configurations. The chip lacks integrated graphics and comes with a 130W TDP. As an unlocked 'K' series processor, it allows for overclocking. Though long discontinued, the i7-3910K provides a cost-effective way to access 6-core performance and massive I/O on the legacy X79 platform for budget workstation builds.
The Bottom Line
Overview & Launch
Specifications Compared
Performance Compared
Productivity
6 cores and 12 threads provide solid performance for rendering.
Solid performance for older software and moderate rendering tasks, but falls behind modern 6-core CPUs in IPC and clock speed.
Gaming
Decent for gaming, but lower clocks limit modern CPU-heavy games.
Playable in modern esports and AAA titles when paired with a strong GPU, but likely to bottleneck top-tier cards in CPU-intensive scenarios.
Virtualization
Excellent for VMs thanks to 12 threads and quad-channel memory.
Excellent value for home labs due to high core count, VT-d support, and PCIe lane availability for multiple NICs or storage controllers.
Efficiency
130W TDP is high, and 32nm is inefficient.
High power consumption (140W TDP) and heat output compared to 14nm, 10nm, or 7nm counterparts.
Specialized Performance
AI / ML
- No AI acceleration
- PCIe 3.0 is okay for older accelerators
- No dedicated AI or matrix acceleration hardware.
- AVX2 support offers some vector compute capability.
Content Creation
Gaming
- 6 cores help with modern games
- Lower base clock limits single-core performance
- Needs discrete GPU
- Requires discrete graphics; no integrated GPU.
- PCIe 3.0 lanes limit full potential of modern RTX 40-series GPUs.
- Boost clocks are modest by modern standards.
Industry Impact
Best CPU by Use Case
Target Audience
Strengths & Weaknesses
Pros
- 6 cores and 12 threads
- 40 PCIe 3.0 lanes
- Quad-channel memory
- Unlocked multiplier
Cons
- High 130W TDP
- Low base clock (3.0 GHz)
- 32nm process is inefficient
- Obsolete platform
Pros
- Relatively low entry cost for a used HEDT platform
- Quad-channel DDR4 memory support
- 28 PCIe lanes allow for multiple expansion cards
- Unlocked for overclocking
- Strong multi-core performance for its era
Cons
- High power draw and heat output
- No integrated graphics
- Limited to 28 PCIe lanes (fewer than 5930K/5960X)
- Requires expensive X99 motherboards and DDR4 RAM
- Older architecture lacks modern instruction sets like AVX-512
Competitors & Alternatives
Core i7-3910K
- AMD FX-8350Rival
Desktop
- Intel Core i7-3930KRival
HEDT
- Compare head-to-headIntel Core i7-4770KRival
Desktop
- AMD FX-8320Rival
Desktop
- Intel Core i7-3820Rival
HEDT
- Intel Core i7-4930KAlt
Ivy Bridge-E successor with slightly better performance.
Haswell-E successor with DDR4 support.
Compare head-to-head- Intel Core i7-4820KAlt
Cheaper 4-core alternative on the same platform.
Intel Core i7-5820K
- AMD Ryzen 5 1600Rival
Mainstream
- AMD Ryzen 7 1700Rival
Creator
- Compare head-to-headIntel Core i7-4790KRival
Gaming
- AMD FX-9590Rival
Enthusiast
- Compare head-to-headIntel Core i7-6800KRival
Workstation
If you need the full 40 PCIe lanes for tri-SI or heavy storage arrays.
Compare head-to-head- AMD Ryzen 5 5600Alt
A modern, significantly faster and more efficient gaming CPU.
Modern platform with PCIe 5.0 and DDR5 support.
Compare head-to-head- AMD Ryzen 9 5900XAlt
Massive multi-core performance jump for content creation.
More cores and higher frequency on a still-recent mainstream platform.
Compare head-to-head
Our Verdict on Each
A great entry point to the LGA 2011 platform, offering 6 cores and full PCIe 3.0 lanes at a lower price point.
Best for: Budget X79 workstation build
Read the full reviewThe i7-5820K was a groundbreaking value proposition in 2014, bringing DDR4 and quad-channel memory to a lower price point. Today, it remains viable only for budget builds, handicapped by high power consumption and limited PCIe lanes compared to modern standards.
Best for: Building a budget-friendly used workstation for virtualization or light content creation.
Read the full reviewFrequently Asked Questions
Which is better, Core i7-3910K or Intel Core i7-5820K?
Based on our editorial ratings, the Core i7-3910K comes out ahead with a score of 7.8/10. 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, Core i7-3910K or Intel Core i7-5820K?
For gaming, the Intel Core i7-5820K leads with a gaming performance score of 65/100 among Core i7-3910K and Intel Core i7-5820K.
Which uses less power?
The Core i7-3910K has the lowest rated TDP. Power draw across these chips: Core i7-3910K (130 W), Intel Core i7-5820K (140 W).
Do Core i7-3910K and Intel Core i7-5820K use the same socket?
No. They use different sockets (Core i7-3910K: LGA 2011, Intel Core i7-5820K: FCLGA2011-3 (LGA2011-v3)), so each needs a compatible motherboard.
Which is faster in multi-core benchmarks?
The Core i7-3910K posts the highest multi-core benchmark score. Multi-core results: Core i7-3910K (12,000). Benchmark figures are approximate and workload-dependent.