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Gaming Performance Comparison

Recommended System Requirements
Game Xeon Processor L5640 Core 2 Quad Q9400 2.66GHz
Halo: Reach 30% 2%
Cyberpunk 2077 45% 101%
Red Dead Redemption 2 71% 136%
Dragon Ball Z Kakarot 29% 79%
Call of Duty: Modern Warfare 26% 75%
Microsoft Flight Simulator 86% 157%
Doom Eternal 40% 94%
Grand Theft Auto VI 132% 221%
FIFA 20 22% 69%
Need For Speed Heat 44% 100%

In terms of overall gaming performance, the Intel Xeon Processor L5640 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 Xeon Processor L5640 was released over a year more recently than the Core 2 Quad, and so the Xeon Processor L5640 is likely to have better levels of support, and will be more optimized for running the latest games.

The Xeon Processor L5640 has 2 more cores than the Core 2 Quad. 6 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.

The Xeon Processor L5640 has 8 more threads than the Core 2 Quad. The Core 2 Quad has one thread per physical core, whereas the Xeon Processor L5640 uses hyperthreading and has 2 logical threads 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 Xeon Processor L5640 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 0.434 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 Xeon Processor L5640.

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 Xeon Processor L5640 has a 6144 KB bigger L2 cache than the Core 2 Quad, but neither of the CPUs have L3 caches, so the Xeon Processor L5640 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 Xeon Processor L5640 has a 35 Watt lower Maximum TDP than the Core 2 Quad, and was created with a 13 nm smaller manufacturing technology. What this means is the Xeon Processor L5640 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 CodenameWestmere-EPYorkfield
MoBo SocketLGA 1366/Socket BLGA 775/ Socket T
Notebook CPUnono
Release Date16 Mar 201010 Aug 2008
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores6vs4
CPU Threads12vs4
Clock Speed2.226 GHzvs2.66 GHz
Turbo Frequency2.8 GHzvs-
Max TDP60 Wvs95 W
Lithography32 nmvs45 nm
Bit Width64 Bitvs64 Bit
Max Temperature69°Cvs71°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size384 KBvs256 KB
L2 Cache Size12288 KBvs6144 KB
L3 Cache Size-vs-
Max Memory 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-
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PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewXeon Processor L5640 is a Low Voltage Server Processor based on the 32nm, Westmere Architecture.

It offers 6 Physical Cores (12 Logical), Clocked at 2.26GHz that go up to 2.8GHz, in Turbo Mode 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 60W.

It offers average performance. It will therefore become a bottleneck in today's demanding games.
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.

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