7.4
Check Prices $182
9.2
Check Prices $339
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Gaming Performance Comparison

Recommended System Requirements
Game Core i5-9400F 6-Core 2.9GHz Core i7-4790K 4-Core 4.0GHz
Red Dead Redemption 2 0% 9%
Call of Duty: Modern Warfare 26% 33%
Cyberpunk 2077 15% 23%
Halo: Reach 59% 62%
Star Wars: Jedi - Fallen Order 11% 0%
Microsoft Flight Simulator 9% 1%
Borderlands 3 0% 9%
Detroit: Become Human 14% 22%
FIFA 20 28% 35%
eFootball PES 2020 18% 25%

In terms of overall gaming performance, the Intel Core i7-4790K 4-Core 4.0GHz is significantly better than the Intel Core i5-9400F 6-Core 2.9GHz when it comes to running the latest games. This also means it will be less likely to bottleneck more powerful GPUs, allowing them to achieve more of their gaming performance potential.

The Core i5-9400F 6-Core was released over three years more recently than the Core i7-4790K 4-Core, and so the Core i5-9400F 6-Core is likely to have far better levels of support, and will be much more optimized and ultimately superior to the Core i7-4790K 4-Core when running the latest games.

Both CPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings (assuming they are accompanied by equivalently powerful GPUs).

The Core i5-9400F 6-Core has 2 more cores than the Core i7-4790K 4-Core. 6 cores is probably excessive if you mean to just run the latest games, as games are not yet able to harness this many cores. The cores in the Core i7-4790K 4-Core is more than enough for gaming purposes.

The Core i7-4790K 4-Core has 2 more threads than the Core i5-9400F 6-Core. The Core i5-9400F 6-Core has one thread per physical core, whereas the Core i7-4790K 4-Core uses hyperthreading and has 2 logical threads per physical core.

Multiple threads are useful for improving the performance of multi-threaded applications. Additional cores and their accompanying thread will always be beneficial for multi-threaded applications. Hyperthreading will be beneficial for applications optimized for it, but it may slow others down. For games, the number of threads is largely irrelevant, as long as you have at least 2 cores (preferably 4), and hyperthreading can sometimes even hit performance.

More important for gaming than the number of cores and threads is the clock rate. Problematically, unless the two CPUs are from the same family, this can only serve as a general guide and nothing like an exact comparison, because the clock cycles per instruction (CPI) will vary so much.

The Core i5-9400F 6-Core and Core i7-4790K 4-Core are not from the same family of CPUs, so their clock speeds are by no means directly comparable. Bear in mind, then, that while the Core i7-4790K 4-Core has a 1.1 GHz faster frequency, this is not always an indicator that it will be superior in performance, despite frequency being crucial when trying to avoid GPU bottlenecking. In this case, however, the difference is probably a good indicator that the Core i5-9400F 6-Core is superior.

Aside from the clock rate, the next-most important CPU features for PC game performance are L2 and L3 cache size. Faster than RAM, the more cache available, the more data that can be stored for lightning-fast retrieval. L1 Cache is not usually an issue anymore for gaming, with most high-end CPUs eking out about the same L1 performance, and L2 is more important than L3 - but L3 is still important if you want to reach the highest levels of performance. Bear in mind that although it is better to have a larger cache, the larger it is, the higher the latency, so a balance has to be struck.

The maximum Thermal Design Power is the power in Watts that the CPU will consume in the worst case scenario. The lithography is the semiconductor manufacturing technology being used to create the CPU - the smaller this is, the more transistors that can be fit into the CPU, and the closer the connections. For both the lithography and the TDP, it is the lower the better, because a lower number means a lower amount of power is necessary to run the CPU, and consequently a lower amount of heat is produced.

The Core i5-9400F 6-Core has a 23 Watt lower Maximum TDP than the Core i7-4790K 4-Core, and was created with a 8 nm smaller manufacturing technology. What this means is the Core i5-9400F 6-Core will consume significantly less power and consequently produce less heat, enabling more prolonged computational tasks with fewer adverse effects. This will lower your yearly electricity bill significantly, as well as prevent you from having to invest in extra cooling mechanisms (unless you overclock).

The Core i7-4790K 4-Core has an on-board GPU, which means that it will be capable of running basic graphics applications (i.e., games) without the need for a dedicated graphics card. The Core i5-9400F 6-Core, however, does not, and you will probably have to look for a dedicated card if you wish to use it at all.

For in-depth GPU comparisons with the HD i7 4790K, click on the following GPU overview comparison icon (visible throughout Game-Debate), and choose a GPU from the list to compare against:

On-board GPUs tend to be fairly awful in comparison to dedicated cards from the likes of AMD or Nvidia, but as they are built into the CPU, they also tend to be cheaper and require far less power to run (this makes them a good choice for laptops). We would recommend a dedicated card for running the latest games, but integrated GPUs are improving all the time and casual gamers may find less recent games perform perfectly acceptably.

CPU Core Details

CPU CodenameCoffee LakeDevils Canyon
MoBo SocketLGA 1151LGA 1150
Notebook CPUnono
Release Date31 Jan 201922 Jun 2014
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores6vs4
CPU Threads6vs8
Clock Speed2.9 GHzvs4 GHz
Turbo Frequency4.1 GHzvs4.4 GHz
Max TDP65 Wvs88 W
Lithography14 nmvs22 nm
Bit Width64 Bitvs64 Bit
Max Temperature100°Cvs73°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size-vs256 KB
L2 Cache Size-vs1024 KB
L3 Cache Size9 MBvs8 MB
Max Memory Size-vs32 GB
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsHD i7 4790K
Base GPU Frequency-vs350 MHz
Max GPU Frequency-vs1250 MHz
DirectX-vs11.2
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size37.5mm x 37.5mmvs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewThe Intel Core i5-9400F 6-Core 2.9GHz is a mid-range CPU based on Intel's 9th Gen 14nm, Coffee Lake refresh microarchitecture. It offers 6 physical cores (6 logical) initially clocked at 2.9GHz, which may go up to 4.1GHz using Turbo Boost. It does not have an unlocked multiplier and therefore cannot be overclocked using traditional methods. It has 9MB of SmartCache. Intel SmartCache refers to the architecture that allows all cores to dynamically share access to the last level cache. Level 3 cache is a static memory bank of a processor and it is used to feed it instructions. This processor also supports DDR4 based RAMs with maximum memory support of 64GB. The Core i5-9400F 6-Core 2.9GHz has a maximum Thermal Power Design of 65W. It is on par with competitor processors. Among its many advanced features are Intel Optane Memory support, Intel Turbo Boost 2.0 and Virtualization technology. It Core i5-9400F 6-Core 2.9GHz features no onboard integrated graphics. This CPU is likely to offer decent computational performance and will not be a bottleneck in all but the most CPU-intensive AAA games in 2019.Core i7-4790K 4-Core 4.0GHz is a high-end CPU based on the 22nm, Haswell architecture.

It offers 4 Physical Cores (8 Logical), initially clocked at 4.0GHz, which may go up to 4.4GHz and 8MB of L3 Cache.
Among its many features, HyperThreading, Turbo Boost and Virtualization are activated and the processor has multiplier unlocked.

The processor integrates powerful Graphics called Intel HD i7 4790K (variant of Intel HD Graphics 4600), with 20 Execution Units, initially clocked at 350MHz and that go up to 1250MHz, in Turbo Mode which share the L2 Cache and system RAM with the processor.
Both the processor and integrated graphics have a rated board TDP of 88W.

Compared to Core i7-4770K there's an overall 10% performance boost. Its performance is exceptionally good and enough for even the most demanding applications.

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