i9-9940X vs i7-7800X

VS

Aggregate performance score

Core i7-7800X
2017
6 cores / 12 threads, 140 Watt
8.40
Core i9-9940X
2018
14 cores / 28 threads, 165 Watt
18.28
+118%

Core i9-9940X outperforms Core i7-7800X by a whopping 118% based on our aggregate benchmark results.

Primary details

Comparing Core i7-7800X and Core i9-9940X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking923349
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation3.215.16
Market segmentDesktop processorDesktop processor
SeriesIntel Core i7Intel Core i9
Power efficiency5.4710.10
Architecture codenameSkylake (server) (2017−2019)Skylake (server) (2017−2019)
Release date30 May 2017 (7 years ago)8 October 2018 (6 years ago)
Launch price (MSRP)$383$1,387

Cost-effectiveness evaluation

Performance per price, higher is better.

i9-9940X has 61% better value for money than i7-7800X.

Detailed specifications

Core i7-7800X and Core i9-9940X 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 cores6 (Hexa-Core)14 (Tetradeca-Core)
Threads1228
Base clock speed3.5 GHz3.3 GHz
Boost clock speed4 GHz4.5 GHz
Bus typeDMI 3.0DMI 3.0
Bus rate4 × 8 GT/s4 × 8 GT/s
Multiplier3533
L1 cache384 KB896 KB
L2 cache6 MB14 MB
L3 cache8.25 MB (shared)19.25 MB (shared)
Chip lithography14 nm14 nm
Die sizeno data484 mm2
Maximum core temperature100 °C88 °C
Maximum case temperature (TCase)72 °Cno data
64 bit support++
Windows 11 compatibility++
Unlocked multiplier++

Compatibility

Information on Core i7-7800X and Core i9-9940X 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 configuration1 (Uniprocessor)1 (Uniprocessor)
SocketFCLGA2066FCLGA2066
Power consumption (TDP)140 Watt165 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-7800X and Core i9-9940X. You'll probably need this information if you require some particular technology.

Instruction set extensionsIntel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512
AES-NI++
AVX++
Enhanced SpeedStep (EIST)++
Turbo Boost Technology2.02.0
Hyper-Threading Technology++
TSX++
Turbo Boost Max 3.0no data+

Security technologies

Core i7-7800X and Core i9-9940X technologies aimed at improving security, for example, by protecting against hacks.

EDB++

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-7800X and Core i9-9940X are enumerated here.

VT-d++
VT-x++

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-7800X and Core i9-9940X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR4-2400DDR4-2666
Maximum memory size128 GB128 GB
Max memory channels44
Maximum memory bandwidth85.33 GB/s85.33 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardN/AN/A

Peripherals

Specifications and connection of peripherals supported by Core i7-7800X and Core i9-9940X.

PCIe version3.03.0
PCI Express lanes2844

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.

i7-7800X 8.40
i9-9940X 18.28
+118%

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.

i7-7800X 12856
i9-9940X 27975
+118%

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.

i7-7800X 1359
i9-9940X 1465
+7.8%

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.

i7-7800X 6148
i9-9940X 10297
+67.5%

Gaming performance

Pros & cons summary


Performance score 8.40 18.28
Recency 30 May 2017 8 October 2018
Physical cores 6 14
Threads 12 28
Power consumption (TDP) 140 Watt 165 Watt

i7-7800X has 17.9% lower power consumption.

i9-9940X, on the other hand, has a 117.6% higher aggregate performance score, an age advantage of 1 year, and 133.3% more physical cores and 133.3% more threads.

The Core i9-9940X is our recommended choice as it beats the Core i7-7800X in performance tests.


Should you still have questions on choice between Core i7-7800X and Core i9-9940X, ask them in Comments section, and we shall answer.

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Intel Core i7-7800X
Core i7-7800X
Intel Core i9-9940X
Core i9-9940X

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Community ratings

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Questions & comments

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