Intel Core i5-9400T vs Intel Core i7-7800X

Comparative analysis of Intel Core i5-9400T and Intel Core i7-7800X processors for all known characteristics in the following categories: Essentials, Performance, Memory, Compatibility, Security & Reliability, Advanced Technologies, Virtualization, Peripherals. Benchmark processor performance analysis: PassMark - Single thread mark, PassMark - CPU mark, Geekbench 4 - Single Core, Geekbench 4 - Multi-Core, 3DMark Fire Strike - Physics Score.

Intel Core i5-9400T

Intel Core i7-7800X

Differences

Reasons to consider the Intel Core i5-9400T

CPU is newer: launch date 1 year(s) 3 month(s) later
Around 9% more L3 cache; more data can be stored in the L3 cache for quick access later
4x lower typical power consumption: 35 Watt vs 140 Watt

Launch date	September 2018 vs June 2017
L3 cache	9 MB (shared) vs 8448 KB (shared)
Thermal Design Power (TDP)	35 Watt vs 140 Watt

Reasons to consider the Intel Core i7-7800X

Processor is unlocked, an unlocked multiplier allows for easier overclocking
Around 122% higher clock speed: 4.00 GHz vs 1.8 GHz
Around 13% better performance in PassMark - Single thread mark: 2389 vs 2113
Around 55% better performance in PassMark - CPU mark: 12883 vs 8337

Specifications (specs)
Unlocked	Unlocked vs Locked
Maximum frequency	4.00 GHz vs 1.8 GHz
Benchmarks
PassMark - Single thread mark	2389 vs 2113
PassMark - CPU mark	12883 vs 8337

Compare benchmarks

CPU 1: Intel Core i5-9400T
CPU 2: Intel Core i7-7800X

PassMark - Single thread mark

CPU 1

CPU 2

2113

2389

PassMark - CPU mark

CPU 1

CPU 2

8337

12883

Name	Intel Core i5-9400T	Intel Core i7-7800X
PassMark - Single thread mark	2113	2389
PassMark - CPU mark	8337	12883
Geekbench 4 - Single Core		1109
Geekbench 4 - Multi-Core		6640
3DMark Fire Strike - Physics Score		6534

Compare specifications (specs)

	Intel Core i5-9400T	Intel Core i7-7800X
Essentials
Architecture codename	Coffee Lake	Skylake
Launch date	September 2018	June 2017
Place in performance rating	1149	1150
Vertical segment	Desktop	Desktop
Launch price (MSRP)		$416
Price now		$378.99
Processor Number		i7-7800X
Series		Intel® Core™ X-series Processors
Status		Launched
Value for money (0-100)		11.29
Performance
64 bit support
L1 cache	64K (per core)	64 KB (per core)
L2 cache	256K (per core)	256 KB (per core)
L3 cache	9 MB (shared)	8448 KB (shared)
Manufacturing process technology	14 nm	14 nm
Maximum case temperature (TCase)	72 °C	72 °C
Maximum frequency	1.8 GHz	4.00 GHz
Number of cores	6	6
Base frequency		3.50 GHz
Bus Speed		8 GT/s DMI3
Maximum core temperature		100°C
Number of QPI Links		0
Number of threads		12
Unlocked
Memory
Supported memory types	DDR4	DDR4-2400
Max memory channels		4
Maximum memory size		128 GB
Compatibility
Max number of CPUs in a configuration	1	1
Thermal Design Power (TDP)	35 Watt	140 Watt
Low Halogen Options Available
Sockets supported		FCLGA2066
Thermal Solution		PCG 2017X
Security & Reliability
Intel® Trusted Execution technology (TXT)
Execute Disable Bit (EDB)
Advanced Technologies
Intel® Advanced Vector Extensions (AVX)
Intel® AES New Instructions
Enhanced Intel SpeedStep® technology
Instruction set extensions		Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512
Intel 64
Intel® Hyper-Threading technology
Intel® Optane™ Memory Supported
Intel® Turbo Boost technology
Number of AVX-512 FMA Units		2
Virtualization
Intel® Virtualization Technology (VT-x)
Intel® Virtualization Technology for Directed I/O (VT-d)
Peripherals
Max number of PCIe lanes		28
PCI Express revision		3.0
Scalability		1S Only