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Gaming Performance Comparison

Recommended System Requirements
Game APU A6-9550 4-Core 3.8GHz Athlon II X4 645
Cyberpunk 2077 135% 59%
Hitman 3 217% 114%
Assassins Creed: Valhalla 217% 114%
Call of Duty: Black Ops Cold War 128% 54%
FIFA 21 120% 49%
Grand Theft Auto VI 287% 161%
Far Cry 6 271% 151%
Genshin Impact 78% 20%
Battlefield 6 229% 123%
Resident Evil 8 161% 77%

In terms of overall gaming performance, the AMD Athlon II X4 645 is massively better than the AMD APU A6-9550 4-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 APU A6-9550 4-Core was released over three years more recently than the Athlon II X4, and so the APU A6-9550 4-Core is likely to have far better levels of support, and will be much more optimized and ultimately superior to the Athlon II X4 when running the latest games.

The Athlon II X4 has 2 more cores than the APU A6-9550 4-Core. With 4 cores, the Athlon II X4 is much less likely to struggle with the latest games, or bottleneck high-end graphics cards when running them.

The Athlon II X4 has 2 more threads than the APU A6-9550 4-Core. 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 A6-9550 4-Core and Athlon II X4 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 A6-9550 4-Core has a 0.7 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 Athlon II X4.

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 Athlon II X4 has a 1024 KB bigger L2 cache than the APU A6-9550 4-Core, but neither of the CPUs have L3 caches, so the Athlon II X4 wins out in this area with its larger L2 cache.

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 APU A6-9550 4-Core has a 30 Watt lower Maximum TDP than the Athlon II X4, and was created with a 17 nm smaller manufacturing technology. What this means is the APU A6-9550 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).

CPU Core Details

CPU CodenameBristol RidgePropus
MoBo SocketSocket AM4Socket AM3
Notebook CPUnono
Release Date27 Jul 202021 Sep 2010
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores2vs4
CPU Threads2vs4
Clock Speed3.8 GHzvs3.1 GHz
Turbo Frequency4 GHzvs-
Max TDP65 Wvs95 W
Lithography28 nmvs45 nm
Bit Width64 Bitvs64 Bit
Max Temperature90°Cvs71°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size160 KBvs512 KB
L2 Cache Size1024 KBvs2048 KB
L2 Cache Speed-vs-
L3 Cache Size-vs-
Max Memory Size-vs-
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

Graphics
Base GPU Frequency-vs-
Max GPU Frequency-vs-
DirectX-vs-
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 ReviewThe AMD APU A6-9550 4-Core 3.8GHz is a budget APU based on AMD's 28nm Excavator microarchitecture. It offers 4 physical cores (4 logical) initially clocked at 3.8GHz, rising to 4.0GHz in boost mode. It has an unlocked multiplier and therefore can overclocked using traditional methods. It has 1MB of L2 Cache. This processor also supports DDR4 based RAMs with maximum memory support of 64GB. It has a maximum Thermal Power Design of 65W, making it an averagely power efficient CPU. Among its many features are Cool n Quiet, CoolCore Technology, Extended Frequency Range (XFX), Pure Power and Precision Boost are enabled. The APU A6-9550 4-Core 3.8GHz features integrated Radeon R5 3rd Gen GCN graphics with 384 Shaders and a base clock speed of 1,029MHz. This is a low-end graphics chip that will struggle to run any modern game at 720p.Athlon II X4 645 is a performance processor based on the 45nm, K10 micro-architecture.

It offers 4 Physical Cores (4 Logical), clocked at 3.1GHz and 2MB of L2 Cache.
Among its many features, Virtualization is activated.

The processor DOES NOT integrate any graphics. and has a rated board TDP of 95W.

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