Select any two CPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Core 2 Extreme QX6850 3.0GHz Core 2 Quad Q9450 2.66GHz
Cyberpunk 2077 97% 94%
Red Dead Redemption 2 101% 97%
Doom Eternal 90% 87%
Microsoft Flight Simulator 148% 144%
Resident Evil 3 Remake 116% 113%
Need For Speed Heat 96% 93%
Grand Theft Auto VI 236% 231%
BeamNG.drive 136% 132%
Star Citizen 90% 87%
Star Wars: Jedi - Fallen Order 175% 171%

In terms of overall gaming performance, the Intel Core 2 Quad Q9450 2.66GHz is marginally better than the Intel Core 2 Extreme QX6850 3.0GHz 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 Core 2 Quad was released less than a year after the Core 2 Extreme, and so they are likely to have similar levels of support, and similarly optimized performance when running the latest games.

Both CPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings (assuming they are accompanied by equivalently powerful GPUs).

The Core 2 Extreme and the Core 2 Quad both have 4 cores, which is not likely to be a limiting factor for gaming.

Both the Intel Core 2 Extreme QX6850 3.0GHz 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 Core 2 Extreme and Core 2 Quad 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 Core 2 Extreme has a 0.34 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 .

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 Core 2 Quad has a 4096 KB bigger L2 cache than the Core 2 Extreme, but neither of the CPUs have L3 caches, so the Core 2 Quad 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 Core 2 Quad has a 35 Watt lower Maximum TDP than the Core 2 Extreme, and was created with a 20 nm smaller manufacturing technology. What this means is the Core 2 Quad 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 CodenameKentsfieldYorkfield
MoBo SocketLGA 775/ Socket TLGA 775/ Socket T
Notebook CPUnono
Release Date09 Apr 200707 Jan 2008
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs4
CPU Threads4vs4
Clock Speed3 GHzvs2.66 GHz
Turbo Frequency-vs-
Max TDP130 Wvs95 W
Lithography65 nmvs45 nm
Bit Width64 Bitvs64 Bit
Max Temperature65°Cvs71°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs256 KB
L2 Cache Size8192 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

Performance Value

CPU Mini Review

Mini ReviewCore 2 Extreme QX6850 3.0GHz is a performance Processor based on the 65nm Core micro-architecture.

It offers 4 Physical Cores (4 Logical), clocked at 3.0GHz and 8MB of L2 Cache.
Among its many features, Virtualization is activated.

The processor DOES NOT integrate any graphics. and has a rated board TDP of 130W.

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