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Gaming Performance Comparison

Recommended System Requirements
Game APU A6-7400K Dual-Core APU A6-6400B Dual-Core
Cyberpunk 2077 197% 202%
Assassins Creed: Valhalla 299% 307%
Call of Duty: Black Ops Cold War 188% 193%
Grand Theft Auto VI 388% 397%
FIFA 21 177% 183%
Genshin Impact 125% 129%
Far Cry 6 368% 377%
Hitman 3 299% 307%
Watch Dogs Legion 299% 307%
World of Warcraft: Shadowlands 361% 370%

In terms of overall gaming performance, the AMD APU A6-7400K Dual-Core is marginally better than the AMD APU A6-6400B Dual-Core 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 APU A6-7400K Dual-Core was released over a year more recently than the APU A6-6400B Dual-Core, and so the APU A6-7400K Dual-Core is likely to have better levels of support, and will be more optimized for running the latest games.

The APU A6-7400K Dual-Core and the APU A6-6400B Dual-Core both have 2 cores, and so are quite likely to struggle with the latest games, or at least bottleneck high-end graphics cards when running them. With a decent accompanying GPU, the APU A6-7400K Dual-Core and the APU A6-6400B Dual-Core may still be able to run slightly older games fairly effectively.

Both the AMD APU A6-7400K Dual-Core and the AMD APU A6-6400B Dual-Core 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 APU A6-7400K Dual-Core and APU A6-6400B Dual-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 APU A6-6400B Dual-Core has a 0.4 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 enough that it possibly indicates the superiority of the .

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 APU A6-7400K Dual-Core and the APU A6-6400B Dual-Core have the same L2 cache size, and neither CPU appears to have an L3 cache. They even have the same L1 cache size, so are identical in terms of cache size.

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.

Both the APU A6-7400K Dual-Core and the APU A6-6400B Dual-Core have the same TDP of 65 Watts, but the APU A6-7400K Dual-Core has a lower lithography size, and so will affect your yearly electricity bills less adversely.

The APU A6-7400K Dual-Core and the APU A6-6400B Dual-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 CodenameKaveriRichland
MoBo SocketSocket FM2+Socket FM2
Notebook CPUnono
Release Date30 Jun 201401 Jun 2013
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores2vs2
CPU Threads2vs2
Clock Speed3.5 GHzvs3.9 GHz
Turbo Frequency3.9 GHzvs4.1 GHz
Max TDP65 Wvs65 W
Lithography28 nmvs32 nm
Bit Width64 Bitvs64 Bit
Max Temperature70°Cvs74°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size128 KBvs128 KB
L2 Cache Size1024 KBvs1024 KB
L3 Cache Size-vs-
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsRadeon R5 7400KRadeon HD 8470D
Base GPU Frequency756 MHzvs800 MHz
Max GPU Frequency-vs-
DirectX11.2vs11.1
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size-vs40mmx40mm
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewAPU A8-7400K Dual-Core is a performance CPU based on the 28nm, Steamroller architecture.

It offers 2 Physical Cores (2 Logical), initially clocked at 3.5GHz, which may go up to 3.9GHz and 1MB of L2 Cache.
Among its many features, Turbo Core and Virtualization are activated.

The processor integrates mildly powerful Graphics called Radeon R5 7400K, with 256 Shader Processing Units, clocked at 756MHz, which share the L2 Cache and system RAM with the processor.
Both the processor and integrated graphics have a rated board TDP of 65W.

It offers average performance. This means it will become a bottleneck in some demanding applications.
APU A6-6400B Dual-Core is a performance CPU based on the 32nm, Piledriver architecture.

It offers 2 Physical Cores (2 Logical), initially clocked at 3.9GHz, which may go up to 4.1GHz and 1MB of L2 Cache.
Among its many features, Turbo Core and Virtualization are activated.

The processor integrates weak Graphics called Radeon HD 8470D, with 192 Shader Processing Units, clocked at 800MHz, which share the L2 Cache and system RAM with the processor.
Both the processor and integrated graphics have a rated board TDP of 65W.

It offers average performance. This means it will become a bottleneck in some demanding applications.