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Gaming Performance Comparison

Recommended System Requirements
Game Core 2 Quad Q9400 2.66GHz Core 2 Quad Q9450 2.66GHz
Halo: Reach 2% 6%
Cyberpunk 2077 101% 94%
Dragon Ball Z Kakarot 79% 72%
Red Dead Redemption 2 136% 128%
Call of Duty: Modern Warfare 75% 69%
Microsoft Flight Simulator 157% 148%
Doom Eternal 94% 87%
Grand Theft Auto VI 221% 210%
FIFA 20 69% 63%
Need For Speed Heat 100% 93%

In terms of overall gaming performance, the Intel Core 2 Quad Q9450 2.66GHz is marginally better than the Intel Core 2 Quad Q9400 2.66GHz 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 Q9400 2.66GHz was released less than a year after the Q9450 2.66GHz, and so they are likely to have similar levels of support, and similarly optimized performance when running the latest games.

The Q9400 2.66GHz and the Q9450 2.66GHz both have 4 cores, which is not likely to be a limiting factor for gaming.

Both the Intel Core 2 Quad Q9400 2.66GHz and the Intel Core 2 Quad Q9450 2.66GHz 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 Q9400 2.66GHz and the Q9450 2.66GHz are from the same family of CPUs, and thus their clock speeds are directly comparable. That isn't particularly helpful, however, as the Q9400 2.66GHz and the Q9450 2.66GHz provide identical clock rates and thus extremely similar performance.

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 Q9450 2.66GHz has a 6144 KB bigger L2 cache than the Q9400 2.66GHz, but neither of the CPUs have L3 caches, so the Q9450 2.66GHz 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.

Both the Q9400 2.66GHz and the Q9450 2.66GHz have the same TDP of 95 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 CodenameYorkfieldYorkfield
MoBo SocketLGA 775/ Socket TLGA 775/ Socket T
Notebook CPUnono
Release Date10 Aug 200807 Jan 2008
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs4
CPU Threads4vs4
Clock Speed2.66 GHzvs2.66 GHz
Turbo Frequency-vs-
Max TDP95 Wvs95 W
Lithography45 nmvs45 nm
Bit Width64 Bitvs64 Bit
Max Temperature71°Cvs71°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs256 KB
L2 Cache Size6144 KBvs12288 KB
L3 Cache 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

Grand Theft Auto IVvs
Need For Speed: Most Wanted 2vs
Performance Value

CPU Mini Review

Mini ReviewCore 2 Quad Q9400 2.66GHz is a high-end Processor based on the 45nm Core micro-architecture.

It offers 4 Physical Cores (4 Logical), clocked at 2.66GHz and 6MB 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 offers average performance. It will therefore become a bottleneck in today's demanding games.
Core 2 Quad Q9450 2.66GHz is a high-end Processor based on the 45nm Core micro-architecture.

It offers 4 Physical Cores (4 Logical), clocked at 2.66Hz and 12MB 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.

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