i5-6400 vs i7-7740X

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Aggregate performance score

Core i7-7740X
2017
4 cores / 8 threads, 112 Watt
6.06
+77.7%
Core i5-6400
2015
4 cores / 4 threads, 65 Watt
3.41

Core i7-7740X outperforms Core i5-6400 by an impressive 78% based on our aggregate benchmark results.

Primary details

Comparing Core i7-7740X and Core i5-6400 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking11011564
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation2.310.78
Market segmentDesktop processorDesktop processor
SeriesCore i7 (Desktop)Intel Core i5
Power efficiency5.124.96
Architecture codenameKaby Lake-X (2017)Skylake (2015−2016)
Release date30 May 2017 (7 years ago)1 September 2015 (9 years ago)
Launch price (MSRP)$339$187

Cost-effectiveness evaluation

Performance per price, higher is better.

i7-7740X has 196% better value for money than i5-6400.

Detailed specifications

Core i7-7740X and Core i5-6400 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 cores4 (Quad-Core)4 (Quad-Core)
Threads84
Base clock speed4.3 GHz2.7 GHz
Boost clock speed4.5 GHz3.3 GHz
Bus typeDMI 3.0DMI 3.0
Bus rate4 × 8 GT/s4 × 8 GT/s
Multiplierno data27
L1 cache256 KB256 KB
L2 cache1 MB1 MB
L3 cache8 MB (shared)6 MB (shared)
Chip lithography14 nm14 nm
Die sizeno data122 mm2
Maximum core temperature100 °Cno data
Maximum case temperature (TCase)72 °C72 °C
64 bit support++
Windows 11 compatibility--
Unlocked multiplier+-

Compatibility

Information on Core i7-7740X and Core i5-6400 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)
SocketFCLGA2066FCLGA1151
Power consumption (TDP)112 Watt65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-7740X and Core i5-6400. You'll probably need this information if you require some particular technology.

Instruction set extensionsIntel® SSE4.1, Intel® SSE4.2, Intel® AVX2Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI++
AVX++
vPro++
Enhanced SpeedStep (EIST)++
Turbo Boost Technology2.02.0
Hyper-Threading Technology+-
TSX+-
Idle Statesno data+
Thermal Monitoring-+

Security technologies

Core i7-7740X and Core i5-6400 technologies aimed at improving security, for example, by protecting against hacks.

TXTno data-
EDBno data+
Secure Keyno data+
MPX-+
Identity Protection-+
SGXno dataYes with Intel® ME
OS Guardno data+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-7740X and Core i5-6400 are enumerated here.

AMD-V++
VT-d++
VT-x++
EPTno data+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-7740X and Core i5-6400. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR4DDR3, DDR4
Maximum memory size64 GB64 GB
Max memory channels22
Maximum memory bandwidth42.671 GB/s34.134 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardHD 630Intel HD Graphics 530
Max video memoryno data64 GB
Quick Sync Video-+
Clear Videono data+
Clear Video HDno data+
Graphics max frequencyno data950 MHz
InTru 3Dno data+

Graphics interfaces

Available interfaces and connections of Core i7-7740X and Core i5-6400 integrated GPUs.

Number of displays supportedno data3
eDPno data+
DisplayPort-+
HDMI-+
DVIno data+

Graphics image quality

Maximum display resolutions supported by Core i7-7740X and Core i5-6400 integrated GPUs, including resolutions over different interfaces.

4K resolution supportno data+
Max resolution over HDMI 1.4no data4096x2304@24Hz
Max resolution over eDPno data4096x2304@60Hz
Max resolution over DisplayPortno data4096x2304@60Hz
Max resolution over VGAno dataN/A

Graphics API support

APIs supported by Core i7-7740X and Core i5-6400 integrated GPUs, sometimes API versions are included.

DirectXno data12
OpenGLno data4.5

Peripherals

Specifications and connection of peripherals supported by Core i7-7740X and Core i5-6400.

PCIe version3.03.0
PCI Express lanes1616

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.

i7-7740X 6.06
+77.7%
i5-6400 3.41

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.

i7-7740X 9621
+77.6%
i5-6400 5417

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.

i7-7740X 1655
+47.1%
i5-6400 1125

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.

i7-7740X 5341
+74.3%
i5-6400 3064

Cinebench 10 32-bit single-core

Cinebench R10 is an ancient ray tracing benchmark for processors by Maxon, authors of Cinema 4D. Its single core version uses just one CPU thread to render a futuristic looking motorcycle.

i7-7740X 7397
+45.4%
i5-6400 5088

Cinebench 10 32-bit multi-core

Cinebench Release 10 Multi Core is a variant of Cinebench R10 using all the processor threads. Possible number of threads is limited by 16 in this version.

i7-7740X 29538
+61.4%
i5-6400 18297

wPrime 32

wPrime 32M is a math multi-thread processor test, which calculates square roots of first 32 million integer numbers. Its result is measured in seconds, so that the less is benchmark result, the faster the processor.

i7-7740X 5.44
+92.6%
i5-6400 10.48

Cinebench 11.5 64-bit multi-core

Cinebench Release 11.5 Multi Core is a variant of Cinebench R11.5 which uses all the processor threads. A maximum of 64 threads is supported in this version.

i7-7740X 11
+83.4%
i5-6400 6

Cinebench 15 64-bit multi-core

Cinebench Release 15 Multi Core is a variant of Cinebench R15 which uses all the processor threads.

i7-7740X 991
+94.3%
i5-6400 510

Cinebench 15 64-bit single-core

Cinebench R15 (standing for Release 15) is a benchmark made by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version (sometimes called Single-Thread) only uses a single processor thread to render a room full of reflective spheres and light sources.

i7-7740X 196
+45.9%
i5-6400 134

Cinebench 11.5 64-bit single-core

Cinebench R11.5 is an old benchmark by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version loads a single thread with ray tracing to render a glossy room full of crystal spheres and light sources.

i7-7740X 2.21
+46.4%
i5-6400 1.51

TrueCrypt AES

TrueCrypt is a discontinued piece of software that was widely used for on-the-fly-encryption of disk partitions, now superseded by VeraCrypt. It contains several embedded performance tests, one of them being TrueCrypt AES, which measures data encryption speed using AES algorithm. Result is encryption speed in gigabytes per second.

i7-7740X 5.6
+107%
i5-6400 2.7

x264 encoding pass 2

x264 Pass 2 is a slower variant of x264 video compression that produces a variable bit rate output file, which results in better quality since the higher bit rate is used when it is needed more. Benchmark result is still measured in frames per second.  

i7-7740X 62
+82%
i5-6400 34

x264 encoding pass 1

x264 version 4.0 is a video encoding benchmark uses MPEG 4 x264 compression method to compress a sample HD (720p) video. Pass 1 is a faster variant that produces a constant bit rate output file. Its result is measured in frames per second, which means how many frames of the source video file were encoded per second.  

i7-7740X 234
+55.6%
i5-6400 150

Gaming performance

Pros & cons summary


Performance score 6.06 3.41
Recency 30 May 2017 1 September 2015
Threads 8 4
Power consumption (TDP) 112 Watt 65 Watt

i7-7740X has a 77.7% higher aggregate performance score, an age advantage of 1 year, and 100% more threads.

i5-6400, on the other hand, has 72.3% lower power consumption.

The Core i7-7740X is our recommended choice as it beats the Core i5-6400 in performance tests.


Should you still have questions on choice between Core i7-7740X and Core i5-6400, ask them in Comments section, and we shall answer.

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Intel Core i7-7740X
Core i7-7740X
Intel Core i5-6400
Core i5-6400

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Community ratings

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