Select any two CPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Opteron 6166 HE Core 2 Quad Q9400 2.66GHz
Red Dead Redemption 2 72% 136%
Doom Eternal 42% 94%
Cyberpunk 2077 46% 101%
Call of Duty: Modern Warfare 28% 75%
Dragon Ball Z Kakarot 30% 79%
Microsoft Flight Simulator 87% 157%
Star Wars: Jedi - Fallen Order 90% 161%
Grand Theft Auto VI 134% 221%
Need For Speed Heat 46% 100%
Warcraft 3: Reforged 63% 50%

In terms of overall gaming performance, the AMD Opteron 6166 HE is massively 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 Opteron 6166 HE was released over a year more recently than the Core 2 Quad, and so the Opteron 6166 HE is likely to have better levels of support, and will be more optimized for running the latest games.

The Opteron 6166 HE has 8 more cores than the Core 2 Quad. 12 cores is probably excessive if you mean to just run the latest games, as games are not yet able to harness this many cores. The cores in the Core 2 Quad is more than enough for gaming purposes. However, if you intend on running a server with the Opteron 6166 HE, it would seem to be a decent choice.

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 Opteron 6166 HE 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 Quad has a 0.86 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 Opteron 6166 HE 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 Core 2 Quad has a 5632 KB bigger L2 cache than the Opteron 6166 HE, and although the Core 2 Quad does not appear to have an L3 cache, its larger L2 cache means that it 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.

The Opteron 6166 HE has a 10 Watt lower Maximum TDP than the Core 2 Quad (though they were created with the same size 45 nm manufacturing technology). What this means is the Opteron 6166 HE will consume slightly less power and consequently produce less heat, enabling more prolonged computational tasks with fewer adverse effects. This will lower your yearly electricity bill slightly, as well as prevent you from having to invest in extra cooling mechanisms (unless you overclock).

CPU Core Details

CPU CodenameMagny-CoursYorkfield
MoBo SocketSocket G34LGA 775/ Socket T
Notebook CPUnono
Release Date14 Feb 201110 Aug 2008
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores12vs4
CPU Threads-vs4
Clock Speed1.8 GHzvs2.66 GHz
Turbo Frequency-vs-
System Bus 6400 MHzvs-
Max TDP85 Wvs95 W
Lithography45 nmvs45 nm
Bit Width-vs64 Bit
Voltage Range1.0750 V KBvs-
Max Temperature55°Cvs71°C
Virtualization Technologyyesvsno
Comparison

CPU Cache and Memory

L1 Cache Size128 KBvs256 KB
L1 Cache Count12vs-
L2 Cache Size512 KBvs6144 KB
L2 Cache Count12vs-
L2 Cache Speed1800 MHzvs-
L3 Cache Size12288 MBvs-
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 ReviewOpteron is AMD's x86 server and workstation processor line, and was the first processor which supported the AMD64 instruction set architecture (known generically as x86-64). It was released on April 22, 2003 with the SledgeHammer core (K8) and was intended to compete in the server and workstation markets, particularly in the same segment as the Intel Xeon processor. Processors based on the AMD K10 microarchitecture (codenamed Barcelona) were announced on September 10, 2007 featuring a new quad-core configuration. The most-recently released Opteron CPUs are the Piledriver-based Opteron 4300 and 6300 series processors, codenamed "Seoul" and "Abu Dhabi" respectively.Core 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.

Vendor-Specific Features

AMD Power ManagementIntel Quick Sync Video
AMDBusiness ClassIntel InTru 3D
AMD Black EditionIntel Insider
Intel Wireless Display
Intel Flexible Display
Intel Clear Video HD
Intel vPro
Intel Hyper-Threading
Intel Virt. Tech. for Directed I/O
Intel Trusted Execution
AES New Instructions
Intel Anti-Theft
Idle States
Intel SpeedStep
Thermal Monitoring
Execute Disable Bit
Intel VT-x with EPT
Embedded Options

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