Select any two CPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Pentium Gold G5400 2-Core 3.7GHz Core i7-6700K 4-Core 4.0GHz
Red Dead Redemption 2 63% 9%
Call of Duty: Modern Warfare 21% 33%
Cyberpunk 2077 39% 23%
Star Wars: Jedi - Fallen Order 81% 0%
Halo: Reach 32% 63%
Borderlands 3 63% 9%
FIFA 20 17% 35%
eFootball PES 2020 34% 26%
Fortnite: Chapter 2 10% 50%
Detroit: Become Human 40% 23%

In terms of overall gaming performance, the Intel Core i7-6700K 4-Core 4.0GHz is massively better than the Intel Pentium Gold G5400 2-Core 3.7GHz 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 Pentium Gold G5400 was released over a year more recently than the Core i7-6700K 4-Core, and so the Pentium Gold G5400 is likely to have better levels of support, and will be more optimized for 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 i7-6700K 4-Core has 2 more cores than the Pentium Gold G5400. With 4 cores, the Core i7-6700K 4-Core is much less likely to struggle with the latest games, or bottleneck high-end graphics cards when running them.

The Core i7-6700K 4-Core has 4 more threads than the Pentium Gold G5400. Both the Pentium Gold G5400 and the Core i7-6700K 4-Core use hyperthreading. The Pentium Gold G5400 has 2 logical threads per physical core and the Core i7-6700K 4-Core has 2.

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 Pentium Gold G5400 and Core i7-6700K 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 i7-6700K 4-Core has a 0.3 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. As such, we need to look elsewhere for more reliable comparisons.

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 Core i7-6700K 4-Core has a 512 KB bigger L2 cache than the Pentium Gold G5400, which means that it, at worst, wins out in this area, and at best, will provide superior gaming performance and will work much better with high-end graphics cards.

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 Pentium Gold G5400 has a 40 Watt lower Maximum TDP than the Core i7-6700K 4-Core (though they were created with the same size 14 nm manufacturing technology). What this means is the Pentium Gold G5400 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 Pentium Gold G5400 and the Core i7-6700K 4-Core both have an on-board GPU, which means that they will be capable of running basic graphics applications (i.e., games) without the need for a dedicated graphics card.

For an in-depth GPU comparison, click on the GPU comparison icon that you can find throughout Game-Debate:

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 Lake SSkylake-S
MoBo SocketLGA 1151LGA 1151
Notebook CPUnono
Release Date26 Feb 201805 Aug 2015
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores2vs4
CPU Threads4vs8
Clock Speed3.7 GHzvs4 GHz
Turbo Frequency-vs4.2 GHz
Max TDP51 Wvs91 W
Lithography14 nmvs14 nm
Bit Width64 Bitvs64 Bit
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size128 KBvs256 KB
L2 Cache Size512 KBvs1024 KB
L3 Cache Size4 MBvs8 MB
Max Memory Size-vs32 GB
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsIntel HD Graphics 610HD i7 6700K
Base GPU Frequency350 MHzvs350 MHz
Max GPU Frequency1050 MHzvs1150 MHz
DirectX12.0vs12.0
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size-vs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewThe Pentium Gold G5400 2-Core 3.7GHz is a budget processor based on the 14nm Cofee Lake architecture. It offers 2 Physical Cores (4 Logical), clocked at 3.7GHz and 4MB of L3 Cache. Among its many features, Hyperthreading, Virtualization, and Enhanced SpeedStep are activated. The processor integrates Graphics called Intel UHD Graphics 610 (Kaby Lake), with 24 Execution Units, initially clocked at 350MHz and that go up to 1050MHz, in Turbo Mode which shares the L2 Cache and system RAM with the processor. It will struggle to run the latest AAA games at playable frame rates. Both the processor and integrated graphics have a rated board TDP of 51W. Intel's Pentium Gold G5400 2-Core 3.7GHz offers average to good performance and is classified in the low to middle-class range of processors. This means it will become a bottleneck in some demanding applications, although gaming performance will be largely fine.Core i7-6700K 4-Core 4.0GHz is a high-end CPU based on the 14nm, Skylake MicroArchitecture.

It offers 4 Physical Cores (8 Logical), initially clocked at 4.0GHz, which may go up to 4.2GHz and 8MB of L3 Cache.
Among its many features, HyperThreading, Turbo Boost 2.0 and Virtualization are activated and the processor has its multiplier unlocked.

The processor integrates Powerful Graphics called HD i7 6700K, with 24 Execution Units, initially clocked at 350MHz and that go up to 1150MHz, 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 91W.

Its performance is exceptionally good and enough for even the most demanding applications.

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