1.8
Check Prices $142
6.3
Check Prices $243
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Gaming Performance Comparison

Recommended System Requirements
Game Core i3-9300 4-Core 3.7GHz Core i5-6600K 3.5GHz
Red Dead Redemption 2 30% 9%
Call of Duty: Modern Warfare 3% 19%
Cyberpunk 2077 11% 7%
Halo: Reach 46% 55%
Star Wars: Jedi - Fallen Order 44% 20%
Detroit: Become Human 11% 7%
Borderlands 3 30% 9%
Microsoft Flight Simulator 42% 19%
Resident Evil 3 Remake 22% 2%
FIFA 20 7% 22%

In terms of overall gaming performance, the Intel Core i5-6600K 3.5GHz is massively better than the Intel Core i3-9300 4-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 Core i3-9300 4-Core was released over three years more recently than the Core i5-6600K 3.5GHz, and so the Core i3-9300 4-Core is likely to have far better levels of support, and will be much more optimized and ultimately superior to the Core i5-6600K 3.5GHz 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 i3-9300 4-Core and the Core i5-6600K 3.5GHz both have 4 cores, which is not likely to be a limiting factor for gaming.

Both the Intel Core i3-9300 4-Core 3.7GHz and the Intel Core i5-6600K 3.5GHz have the same number of threads. Both CPUs have one thread 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 i3-9300 4-Core and Core i5-6600K 3.5GHz 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 i3-9300 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 i3-9300 4-Core and the Core i5-6600K 3.5GHz have the same L2 cache size, but the Core i3-9300 4-Core has a 8186 MB bigger L3 cache, so in this area, it wins out over the Core i5-6600K 3.5GHz.

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 i3-9300 4-Core has a 29 Watt lower Maximum TDP than the Core i5-6600K 3.5GHz (though they were created with the same size 14 nm manufacturing technology). What this means is the Core i3-9300 4-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 i3-9300 4-Core and the Core i5-6600K 3.5GHz 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 RSkylake-S
MoBo SocketLGA 1151LGA 1151
Notebook CPUnono
Release Date23 Apr 201901 Sep 2015
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs4
CPU Threads4vs4
Clock Speed3.7 GHzvs3.5 GHz
Turbo Frequency4.3 GHzvs3.9 GHz
Max TDP62 Wvs91 W
Lithography14 nmvs14 nm
Bit Width64 Bitvs64 Bit
Max Temperature100°Cvs-
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs256 KB
L2 Cache Size1024 KBvs1024 KB
L3 Cache Size8192 MBvs6 MB
Max Memory Size-vs32 GB
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsIntel UHD Graphics 630HD i5 6600K
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 Core i3-9300 4-Core 3.7GHz is a low-end desktop CPU based on a refinement of the 14nm++ Coffee Lake microarchitecture. It offers 4 physical cores (4 logical), initially clocked at 3.7GHz, which may go up to 4.3GHz using 4 cores with Turbo Boost. The i3-9300 has 8MB of L3 Cache. This chip supports up to 64GB DDR-2666 MHz memory and features Intel UHD 630 integrated graphics. Among its many features, Turbo Boost 2.0, Optane Memory Support, and Virtualization are activated. It does not feature an unlocked multiplier and therefore cannot be overclocked using traditional methods. This Core i3-9300 CPU offers average gaming performance in 2019 and should not be a major bottleneck in any modern gaming PC. It will be able to play most modern games at 60fps on High graphics performance at any supported resolution without being a hindrance to the accompanying GPU. However, performance may become bottlenecked if playing at 144Hz and 1080p or lower screen resolution.Core i5-6600K 3.5GHz is a Performance Processor based on the 14nm, Skylake MicroArchitecture.

It offers 4 Physical Cores (4 Logical), initially clocked at 3.5GHz, which may go up to 3.9GHz and 6MB of L3 Cache.
Among its many features, Turbo Boost 2.0 and Virtualization are activated and the processor has its multiplier unlocked.

The Processor Integrates Powerful Graphics called HD i5-6600K, 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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