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Gaming Performance Comparison

Recommended System Requirements
Game Phenom II X2 511 Phenom II X4 905e
Cyberpunk 2077 220% 95%
Assassins Creed: Valhalla 331% 163%
Call of Duty: Black Ops Cold War 210% 89%
FIFA 21 199% 82%
Microsoft Flight Simulator 262% 121%
Watch Dogs Legion 331% 163%
World of Warcraft: Shadowlands 397% 203%
Grand Theft Auto VI 426% 221%
Genshin Impact 142% 48%
Horizon: Zero Dawn 262% 121%

In terms of overall gaming performance, the AMD Phenom II X4 905e is massively better than the AMD Phenom II X2 511 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 Phenom II X2 was released over a year more recently than the Phenom II X4, and so the Phenom II X2 is likely to have better levels of support, and will be more optimized for running the latest games.

The Phenom II X4 has 2 more cores than the Phenom II X2. With 4 cores, the Phenom II X4 is much less likely to struggle with the latest games, or bottleneck high-end graphics cards when running them.

The Phenom II X4 has 2 more threads than the Phenom II X2. 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 Phenom II X2 and Phenom 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 Phenom II X2 has a 0.9 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 Phenom II X4 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 Phenom II X2 and the Phenom II X4 have the same L2 cache size, but the Phenom II X2 does not appear to have an L3 cache, so the Phenom II X4 definitely 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 Phenom II X2 and the Phenom II X4 have the same TDP of 65 Watts, and were created with the same manufacturing size of 45 nm, which means they will affect your yearly electricity bill about equally.

CPU Core Details

CPU CodenameCallistoDeneb
MoBo SocketSocket AM2+ / AM3Socket AM3
Notebook CPUnono
Release Date01 Jan 201102 Jun 2009
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores2vs4
CPU Threads2vs4
Clock Speed3.4 GHzvs2.5 GHz
Turbo Frequency-vs-
Max TDP65 Wvs65 W
Lithography45 nmvs45 nm
Bit Width64 Bitvs64 Bit
Max Temperature-vs70°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs64 KB
L2 Cache Size2048 KBvs2048 KB
L3 Cache Size-vs6 MB
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 ReviewPhenom II X2 511 is a middle-class processor based on the 45nm, K10 architecture.

It offers 2 Physical Cores (2 Logical), clocked at 3.4GHz 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 65W.

It offers average performance. This means it will become a bottleneck in some demanding applications.
Phenom II X4 905e is an energy efficient processor based on the 45nm, K10 architecture.

It offers 4 Physical Cores (4 Logical), clocked at 2.5GHz and 6MB of L3 Cache.
Among its many features, Virtualization is activated and the clock multiplier is unlocked, meaning it can be overclocked easily.

The processor DOES NOT integrate any graphics. and has a rated board TDP of 65W.

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