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Intel Core i7 7740X vs i5 9400F

We compared two desktop CPUs: the 4.3 GHz Intel Core i7 7740X with 4-cores against the 2.9 GHz i5 9400F with 6-cores. On this page, you'll find out which processor has better performance in benchmarks, games and other useful information.


General overview and comparison of the processors
Single-Core Performance
Performance in single-threaded apps and benchmarks
Measure performance when all cores are involved
Power Consumption
The efficiency score of electricity consumption
NanoReview Final Score
Generic CPU rating

Key Differences

What are the key differences between 9400F and 7740X
Advantages of Intel Core i7 7740X
  • Unlocked multiplier
  • 10% higher Turbo Boost frequency (4.5 GHz vs 4.1 GHz)
Advantages of Intel Core i5 9400F
  • Newer - released 1 year and 8 months later
  • Supports up to 128 GB DDR4-2666 RAM
  • Consumes up to 42% less energy than the Core i7 7740X – 65 vs 112 Watt
  • Has 2 physical cores more than the 7740X
  • Has 1 MB larger L3 cache size


Comparing the performance of CPUs in benchmarks
Cinebench R20 (Single-Core)
Cinebench R20 (Multi-Core)
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Geekbench 5 (Single-Core)
Geekbench 5 (Multi-Core)


Full technical specification of Intel Core i7 7740X and i5 9400F


Vendor Intel Intel
Released May 30, 2017 January 7, 2019
Launch price 339 USD 189 USD
Type Desktop Desktop
Codename Kaby Lake Coffee Lake
Model number i7-7740X i5-9400F
Socket LGA-2066 LGA-1151
Integrated GPU No No


Cores 4 6
Threads 8 6
Base Frequency 4.3 GHz 2.9 GHz
Turbo Boost Frequency 4.5 GHz 4.1 GHz
Bus frequency - 100 MHz
Multiplier 43x 29x
Bus Bandwidth 8 GT/s 8 GT/s
L1 Cache 64K (per core) 64K (per core)
L2 Cache 256K (per core) 256K (per core)
L3 Cache 8MB (shared) 9MB (shared)
Unlocked Multiplier Yes No


Fabrication Process 14 nm 14 nm
TDP 112 W 65 W
Max. temperature 100°C 100°C

Memory support

Memory types DDR4-2666 DDR4-2666
Memory Size 64 GB 128 GB
Max. Memory Channels 2 2
Max. Memory Bandwidth - 41.6 GB/s
ECC Support No No


Official site Intel Core i7 7740X official page Intel Core i5 9400F official page
PCI Express Version 3.0 3.0
PCI Express Lanes 16 16
Instruction Set SSE4.1, SSE4.2, AVX-2 SSE4.1, SSE4.2, AVX-2

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So which CPU will you choose: Intel Core i5 9400F or i7 7740X?