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Gaming Performance Comparison

Recommended System Requirements
Game APU A6-6420K Dual-Core Pentium G640 2.8GHz
Cyberpunk 2077 196% 132%
Hitman 3 299% 212%
Assassins Creed: Valhalla 299% 212%
The Medium 409% 297%
Resident Evil 8 229% 157%
FIFA 21 177% 117%
Call of Duty: Black Ops Cold War 187% 124%
Grand Theft Auto VI 387% 281%
Genshin Impact 124% 75%
Far Cry 6 368% 265%

In terms of overall gaming performance, the Intel Pentium G640 2.8GHz is significantly better than the AMD APU A6-6420K 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 A6-6420K Dual-Core was released over a year more recently than the Pentium G640 2.8GHz, and so the APU A6-6420K Dual-Core is likely to have better levels of support, and will be more optimized for running the latest games.

The APU A6-6420K Dual-Core and the Pentium G640 2.8GHz 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 A6-6420K Dual-Core and the Pentium G640 2.8GHz may still be able to run slightly older games fairly effectively.

Both the AMD APU A6-6420K Dual-Core and the Intel Pentium G640 2.8GHz 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 A6-6420K Dual-Core and Pentium G640 2.8GHz 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 A6-6420K Dual-Core has a 1.2 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. In this case, however, the difference is probably a good indicator that the is superior.

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 A6-6420K Dual-Core has a 512 KB bigger L2 cache than the Pentium G640 2.8GHz, and although the APU A6-6420K Dual-Core does not appear to have an L3 cache, its larger L2 cache means that it wins out in this area.

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 A6-6420K Dual-Core and the Pentium G640 2.8GHz have the same TDP of 65 Watts, and were created with the same manufacturing size of 32 nm, which means they will affect your yearly electricity bill about equally.

The APU A6-6420K Dual-Core and the Pentium G640 2.8GHz 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 CodenameRichlandSandy Bridge
MoBo SocketSocket FM2LGA 1155/Socket H2
Notebook CPUnono
Release Date01 Mar 201404 Sep 2011
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores2vs2
CPU Threads2vs2
Clock Speed4 GHzvs2.8 GHz
Turbo Frequency4.2 GHzvs-
Max TDP65 Wvs65 W
Lithography32 nmvs32 nm
Bit Width64 Bitvs64 Bit
Max Temperature70°Cvs69°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size128 KBvs128 KB
L2 Cache Size1024 KBvs512 KB
L3 Cache Size-vs3 MB
Max Memory Size-vs32 GB
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsRadeon HD 8470DIntel HD Graphics Desktop (Sandy Bridge)
Base GPU Frequency800 MHzvs850 MHz
Max GPU Frequency-vs1300 MHz
DirectX11.1vs11.1
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 ReviewAPU A6-6420K Dual-Core is a performance CPU based on the 32nm, Piledriver architecture.

It offers 2 Physical Cores (2 Logical), initially clocked at 4.0GHz, which may go up to 4.2GHz and 1MB of L2 Cache.
Among its many features, Turbo Core and Virtualization are activated and the processor has the clock multiplier unlocked, meaning it can be overclocked easily.

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.
Pentium G640 2.8GHz is a budget processor based on the 32nm, Sandy Bridge architecture.

It offers 2 Physical Cores (2 Logical), clocked at 2.8GHz and 3MB of L3 Cache.
Among its many features, Virtualization is activated.

The processor integrates very weak Graphics called Intel HD Graphics Desktop (Sandy Bridge), with 6 Execution Units, initially clocked at 850MHz and that go up to 1100MHz, 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 65W.

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