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CPU Core Details

CPU Codename Deneb Deneb
MoBo Socket Socket AM3 Socket AM3
Notebook CPU no no
Release Date 04 Jan 2011 02 Jun 2009
CPU Link GD Link GD Link
Approved

CPU Technical Specifications

{
CPU Cores 4 4
CPU Threads 4 4
Clock Speed 3.6 GHz 2.5 GHz
Turbo Frequency - -
Max TDP 125 W 65 W
Lithography 45 nm 45 nm
Bit Width 64 Bit 64 Bit
Max Temperature 62°C 70°C
Virtualization Technology no no

CPU Cache and Memory

L1 Cache Size 512 KB 64 KB
L2 Cache Size 2048 KB 2048 KB
L3 Cache Size 6 MB 6 MB
Memory Types
Memory Channels 2 2
ECC Memory Support no no

CPU Graphics

Integrated Graphics no no
Base GPU Frequency - -
Max GPU Frequency - -
DirectX - -
Displays Supported - -

CPU Mini Review

Mini Review Phenom II X4 975 is a performance processor based on the 45nm, K10 architecture. <br/> <br/> It offers 4 Physical Cores (4 Logical), clocked at 3.6GHz and 6MB of L3 Cache. <br/> Among its many features, <b>Virtualization</b> is activated and the clock multiplier is unlocked, meaning it can be overclocked easily. <br/> <br/> The processor DOES NOT integrate any graphics. and has a rated board TDP of 125W. <br/> <br/> It is a powerful processor whose performance is good. It's thus capable of running most applications smoothly without any problem. Phenom II X4 905e is an energy efficient processor based on the 45nm, K10 architecture. <br/> <br/> It offers 4 Physical Cores (4 Logical), clocked at 2.5GHz and 6MB of L3 Cache. <br/> Among its many features, <b>Virtualization</b> is activated and the clock multiplier is unlocked, meaning it can be overclocked easily. <br/> <br/> The processor DOES NOT integrate any graphics. and has a rated board TDP of 65W. <br/> <br/> It offers average performance. This means it will become a bottleneck in some demanding applications.

Gaming Performance Comparison

In terms of overall gaming performance, the AMD Phenom II X4 975 is massively better than the AMD Phenom II X4 905e 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.

Both the Phenom II X4 975 and the Phenom II X4 905e were released at the same time, so are likely to be quite similar.

{ The X4 975 and the X4 905e both have 4 cores, which is not likely to be a limiting factor for gaming.

Both the AMD Phenom II X4 975 and the AMD Phenom II X4 905e 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 X4 975 and the X4 905e are from the same family of CPUs, and thus their clock speeds are directly comparable. With this in mind, it is safe to say that with a 1.1 GHz faster base clock rate, the X4 975 manages to provide massively better performance than the <span class='gpu2Mention'>X4 905e</span>.

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 X4 975 and the X4 905e have the same L2 cache size, and the same L3 cache size, so in terms of cache-related gaming performance, we have to look back to the clock rate, where the X4 975 wins out.

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.