Core i5-6600K vs Core i7-3960X Extreme Edition
Aggregate performance score
Core i7-3960X Extreme Edition outperforms Core i5-6600K by a considerable 41% based on our aggregate benchmark results.
Primary details
Comparing Core i7-3960X Extreme Edition and Core i5-6600K processor market type (desktop or notebook), architecture, sales start time and price.
| Place in performance ranking | 1066 | 1335 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 1.47 | 1.63 |
| Market segment | Desktop processor | Desktop processor |
| Series | Intel Core i7EE | Intel Core i5 (Desktop) |
| Architecture codename | Sandy Bridge (2011−2013) | Skylake (2015−2016) |
| Release date | 14 November 2011 (12 years ago) | 2 July 2015 (8 years ago) |
| Launch price (MSRP) | no data | $242 |
| Current price | $301 | $132 (0.5x MSRP) |
Cost-effectiveness evaluation
Performance per price, higher is better.
i5-6600K has 11% better value for money than i7-3960X Extreme Edition.
Detailed specifications
Core i7-3960X Extreme Edition and Core i5-6600K basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.
| Physical cores | 6 (Hexa-Core) | 4 (Quad-Core) |
| Threads | 12 | 4 |
| Base clock speed | no data | 3.5 GHz |
| Boost clock speed | 3.3 GHz | 3.9 GHz |
| Bus support | 5 GT/s | no data |
| L1 cache | no data | 64K (per core) |
| L2 cache | 1,536 KB | 256K (per core) |
| L3 cache | 15 MB | 6 MB (shared) |
| Chip lithography | 32 nm | 14 nm |
| Die size | 434.72 mm220.9 mm × 20.8 mm | 122 mm2 |
| Maximum core temperature | no data | 64 °C |
| Maximum case temperature (TCase) | no data | 72 °C |
| Number of transistors | 2270 Million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | No | Yes |
Compatibility
Information on Core i7-3960X Extreme Edition and Core i5-6600K compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.
| Number of CPUs in a configuration | 1 (Uniprocessor) | 1 |
| Socket | no data | FCLGA1151 |
| Power consumption (TDP) | 130 Watt | 91 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i7-3960X Extreme Edition and Core i5-6600K. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 |
| AES-NI | + | + |
| AVX | + | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | no data | 2.0 |
| Hyper-Threading Technology | no data | - |
| TSX | no data | + |
| Idle States | no data | + |
| Thermal Monitoring | no data | + |
| SIPP | no data | - |
| Status | no data | Discontinued |
Security technologies
Core i7-3960X Extreme Edition and Core i5-6600K technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | - |
| EDB | no data | + |
| Secure Key | no data | + |
| MPX | no data | + |
| Identity Protection | no data | + |
| SGX | no data | Yes with Intel® ME |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i7-3960X Extreme Edition and Core i5-6600K are enumerated here.
| AMD-V | no data | + |
| VT-d | no data | + |
| VT-x | no data | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core i7-3960X Extreme Edition and Core i5-6600K. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR3, DDR4 |
| Maximum memory size | 64 GB | 64 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 34.1 GB/s |
| ECC memory support | no data | - |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | Intel HD Graphics 530 |
| Max video memory | no data | 64 GB |
| Quick Sync Video | no data | + |
| Clear Video | no data | + |
| Clear Video HD | no data | + |
| Graphics max frequency | no data | 1.15 GHz |
| InTru 3D | no data | + |
Graphics interfaces
Available interfaces and connections of Core i7-3960X Extreme Edition and Core i5-6600K integrated GPUs.
| Number of displays supported | no data | 3 |
| eDP | no data | + |
| DisplayPort | no data | + |
| HDMI | no data | + |
| DVI | no data | + |
Graphics image quality
Maximum display resolutions supported by Core i7-3960X Extreme Edition and Core i5-6600K integrated GPUs, including resolutions over different interfaces.
| 4K resolution support | no data | + |
| Max resolution over HDMI 1.4 | no data | 4096x2304@24Hz |
| Max resolution over eDP | no data | 4096x2304@60Hz |
| Max resolution over DisplayPort | no data | 4096x2304@60Hz |
| Max resolution over VGA | no data | N/A |
Graphics API support
APIs supported by Core i7-3960X Extreme Edition and Core i5-6600K integrated GPUs, sometimes API versions are included.
| DirectX | no data | 12 |
| OpenGL | no data | 4.5 |
Peripherals
Specifications and connection of peripherals supported by Core i7-3960X Extreme Edition and Core i5-6600K.
| PCIe version | 2.00 | 3.0 |
| PCI Express lanes | 40 | 16 |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Core i7-3960X Extreme Edition outperforms Core i5-6600K by 41% based on our aggregate benchmark results.
3DMark Fire Strike Physics
Benchmark coverage: 4%
Core i7-3960X Extreme Edition outperforms Core i5-6600K by 69% in 3DMark Fire Strike Physics.
Pros & cons summary
| Performance score | 5.75 | 4.09 |
| Recency | 14 November 2011 | 2 July 2015 |
| Physical cores | 6 | 4 |
| Threads | 12 | 4 |
| Chip lithography | 32 nm | 14 nm |
| Power consumption (TDP) | 130 Watt | 91 Watt |
The Core i7-3960X Extreme Edition is our recommended choice as it beats the Core i5-6600K in performance tests.
Should you still have questions on choice between Core i7-3960X Extreme Edition and Core i5-6600K, ask them in Comments section, and we shall answer.
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