Select any two CPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Pentium Gold G5420 2-Core 3.8GHz Core i7-6700K 4-Core 4.0GHz
Red Dead Redemption 2 60% 9%
Call of Duty: Modern Warfare 19% 33%
Cyberpunk 2077 36% 23%
Fortnite: Chapter 2 12% 50%
Need For Speed Heat 35% 23%
The Outer Worlds 74% 2%
Microsoft Flight Simulator 74% 2%
Zombieland: Double Tap - Road Trip 60% 9%
Borderlands 3 60% 9%
FIFA 20 15% 35%

In terms of overall gaming performance, the Intel Core i7-6700K 4-Core 4.0GHz is massively better than the Intel Pentium Gold G5420 2-Core 3.8GHz 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 G5420 was released over three years more recently than the Core i7-6700K 4-Core, and so the Pentium Gold G5420 is likely to have far better levels of support, and will be much more optimized and ultimately superior to the Core i7-6700K 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 i7-6700K 4-Core has 2 more cores than the Pentium Gold G5420. 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 G5420. Both the Pentium Gold G5420 and the Core i7-6700K 4-Core use hyperthreading. The Pentium Gold G5420 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 G5420 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 0.2 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 G5420, 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 G5420 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 Date01 Mar 201905 Aug 2015
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores2vs4
CPU Threads4vs8
Clock Speed3.8 GHzvs4 GHz
Turbo Frequency3.8 GHzvs4.2 GHz
Max TDP-vs91 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 UHD Graphics 630HD i7 6700K
Base GPU Frequency350 MHzvs350 MHz
Max GPU Frequency1150 MHzvs1150 MHz
DirectX12vs12.0
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 Pentium Gold G5420 2-Core 3.8GHz is a budget processor based on the 14nm Coffee Lake architecture. It offers 2 Physical Cores (4 Logical) clocked at 3.8GHz, and 4MB of L3 Cache. Among its many features, Hyperthreading, Virtualization, and Enhanced SpeedStep are activated. The processor integrates Graphics called Intel UHD Graphics 630 (Coffee Lake), with 23 Execution Units, initially clocked at 350MHz and that go up to 1150MHz 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 65W. Intel's Pentium Gold G5420 3.8GHz offers good budget performance and is classified in the low-end range of processors. This means it will become a bottleneck in some demanding applications, particularly modern games which rely on multiple cores.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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