Select any two CPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Core i3-6320 3.9GHz Core i7-6700K 4-Core 4.0GHz
Red Dead Redemption 2 68% 9%
Call of Duty: Modern Warfare 25% 33%
Zombieland: Double Tap - Road Trip 68% 9%
Cyberpunk 2077 43% 23%
Microsoft Flight Simulator 83% 2%
Borderlands 3 68% 9%
FIFA 20 20% 35%
The Outer Worlds 47% 21%
eFootball PES 2020 38% 26%
Ghost Recon Breakpoint 86% 0%

In terms of overall gaming performance, the Intel Core i7-6700K 4-Core 4.0GHz is massively better than the Intel Core i3-6320 3.9GHz 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 i3-6320 3.9GHz was released less than a year after the Core i7-6700K 4-Core, and so they are likely to have similar levels of support, and similarly optimized performance 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 Core i3-6320 3.9GHz. 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 Core i3-6320 3.9GHz. Both the Core i3-6320 3.9GHz and the Core i7-6700K 4-Core use hyperthreading. The Core i3-6320 3.9GHz 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 Core i3-6320 3.9GHz and the Core i7-6700K 4-Core are from the same family of CPUs, and thus their clock speeds are directly comparable. With this in mind, it is safe to say that with a 0.1 GHz faster base clock rate, the Core i7-6700K 4-Core manages to provide marginally better performance than the Core i3-6320 3.9GHz.

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 Core i3-6320 3.9GHz, 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 Core i3-6320 3.9GHz has a 44 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 Core i3-6320 3.9GHz 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 i3-6320 3.9GHz 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 CodenameSkylake-SSkylake-S
MoBo SocketLGA 1151LGA 1151
Notebook CPUnono
Release Date01 Sep 201505 Aug 2015
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores2vs4
CPU Threads4vs8
Clock Speed3.9 GHzvs4 GHz
Turbo Frequency-vs4.2 GHz
Max TDP47 Wvs91 W
Lithography14 nmvs14 nm
Bit Width64 Bitvs64 Bit
Max Temperature100°Cvs-
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

GraphicsHD i3 6320HD i7 6700K
Base GPU Frequency350 MHzvs350 MHz
Max GPU Frequency1150 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 ReviewCore i3-6320 3.9GHz is a Middle-Class Processor based on the 14nm, Skylake MicroArchitecture.

It offers 2 Physical Cores (4 Logical), initially clocked at 3.9GHz and 4MB of L3 Cache.
Among its many features, HyperThreading and Virtualization are activated.

The Processor Integrates Powerful Graphics called HD i3-6320, 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 47W.

It is a powerful processor whose performance is good. It's thus capable of running most applications smoothly without any problem.
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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