Core i7-5820K vs Core i9-7900X
Aggregate performance score
i9-7900X outperforms i7-5820K by a whopping 114% based on our aggregate benchmark results.
Primary details
Comparing Core i9-7900X and Core i7-5820K processor market type (desktop or notebook), architecture, sales start time and price.
| Place in performance ranking | 521 | 1027 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 3.35 | 1.14 |
| Market segment | Desktop processor | Desktop processor |
| Series | Core i9 (Desktop) | no data |
| Architecture codename | Skylake (server) (2017−2019) | Haswell-E (2014) |
| Release date | 30 May 2017 (7 years ago) | 1 September 2014 (9 years ago) |
| Launch price (MSRP) | $999 | $410 |
Cost-effectiveness evaluation
Performance per price, higher is better.
i9-7900X has 194% better value for money than i7-5820K.
Detailed specifications
Core i9-7900X and Core i7-5820K 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 | 10 (Deca-Core) | 6 (Hexa-Core) |
| Threads | 20 | 12 |
| Base clock speed | 3.3 GHz | 3.3 GHz |
| Boost clock speed | 3.3 GHz | 3.6 GHz |
| Bus support | 4 × 8 GT/s | no data |
| L1 cache | 640 KB | 64 KB (per core) |
| L2 cache | 10 MB | 256 KB (per core) |
| L3 cache | 13.75 MB | 15 MB (shared) |
| Chip lithography | 14 nm | 22 nm |
| Die size | no data | 356 mm2 |
| Maximum core temperature | 95 °C | 67 °C |
| Maximum case temperature (TCase) | 72 °C | no data |
| Number of transistors | no data | 2,600 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | - |
| Unlocked multiplier | Yes | Yes |
Compatibility
Information on Core i9-7900X and Core i7-5820K 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 | Socket R4 | 2011-3 |
| Power consumption (TDP) | 140 Watt | 140 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i9-7900X and Core i7-5820K. You'll probably need this information if you require some particular technology.
| AES-NI | + | + |
| AVX | + | + |
| vPro | + | no data |
| Enhanced SpeedStep (EIST) | + | + |
| Hyper-Threading Technology | + | no data |
| TSX | + | + |
Security technologies
Core i9-7900X and Core i7-5820K technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i9-7900X and Core i7-5820K are enumerated here.
| AMD-V | + | no data |
| VT-d | + | + |
| VT-x | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core i9-7900X and Core i7-5820K. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4 | DDR4 |
| Maximum memory size | 128 GB | no data |
| Max memory channels | 4 | no data |
| Maximum memory bandwidth | 85.33 GB/s | 68 GB/s |
| ECC memory support | - | - |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | N/A | no data |
Peripherals
Specifications and connection of peripherals supported by Core i9-7900X and Core i7-5820K.
| PCIe version | 3.0 | 2.0 |
| PCI Express lanes | 44 | 28 |
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.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.
GeekBench 5 Single-Core
GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.
GeekBench 5 Multi-Core
GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.
Pros & cons summary
| Performance score | 13.64 | 6.36 |
| Recency | 30 May 2017 | 1 September 2014 |
| Physical cores | 10 | 6 |
| Threads | 20 | 12 |
| Chip lithography | 14 nm | 22 nm |
i9-7900X has a 114.5% higher aggregate performance score, an age advantage of 2 years, 66.7% more physical cores and 66.7% more threads, and a 57.1% more advanced lithography process.
The Core i9-7900X is our recommended choice as it beats the Core i7-5820K in performance tests.
Should you still have questions on choice between Core i9-7900X and Core i7-5820K, ask them in Comments section, and we shall answer.
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