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Gaming Performance Comparison

Recommended System Requirements
Game Core 2 Quad Q8400S 2.66GHz Core i5-650 3.2GHz
Cyberpunk 2077 91% 103%
Hitman 3 157% 174%
Assassins Creed: Valhalla 157% 174%
Resident Evil 8 112% 126%
FIFA 21 79% 90%
Grand Theft Auto VI 214% 234%
Call of Duty: Black Ops Cold War 85% 97%
Genshin Impact 45% 54%
The Medium 228% 249%
Far Cry 6 201% 221%

In terms of overall gaming performance, the Intel Core 2 Quad Q8400S 2.66GHz is very slightly better than the Intel Core i5-650 3.2GHz 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 i5-650 3.2GHz was released less than a year after the Core 2 Quad, and so they are likely to have similar levels of support, and similarly optimized performance when running the latest games.

The Core 2 Quad has 2 more cores than the Core i5-650 3.2GHz. With 4 cores, the Core 2 Quad is much less likely to struggle with the latest games, or bottleneck high-end graphics cards when running them.

Both the Intel Core 2 Quad Q8400S 2.66GHz and the Intel Core i5-650 3.2GHz have the same number of threads. The Core 2 Quad has one thread per physical core, whereas the Core i5-650 3.2GHz 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 Core 2 Quad and Core i5-650 3.2GHz 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 i5-650 3.2GHz has a 0.54 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 Core 2 Quad.

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 3584 KB bigger L2 cache than the Core i5-650 3.2GHz, 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 Core 2 Quad has a 8 Watt lower Maximum TDP than the Core i5-650 3.2GHz. However, the Core i5-650 3.2GHz was created with a 13 nm smaller manufacturing technology. Overall, by taking both into account, the Core i5-650 3.2GHz is likely the CPU with the lower heat production and power requirements, by a small amount.

The Core i5-650 3.2GHz has an on-board GPU, which means that it will be capable of running basic graphics applications (i.e., games) without the need for a dedicated graphics card. The Core 2 Quad, however, does not, and you will probably have to look for a dedicated card if you wish to use it at all.

For in-depth GPU comparisons with the HD i5 650, click on the following GPU overview comparison icon (visible throughout Game-Debate), and choose a GPU from the list to compare against:

On-board GPUs tend to be fairly awful in comparison to dedicated cards from the likes of AMD or Nvidia, but as they are built into the CPU, they also tend to be cheaper and require far less power to run (this makes them a good choice for laptops). We would recommend a dedicated card for running the latest games, but integrated GPUs are improving all the time and casual gamers may find less recent games perform perfectly acceptably.

CPU Core Details

CPU CodenameYorkfieldClarkdale
MoBo SocketLGA 775/ Socket TLGA 1156/Socket H
Notebook CPUnono
Release Date19 Apr 200907 Jan 2010
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores4vs2
CPU Threads4vs4
Clock Speed2.66 GHzvs3.2 GHz
Turbo Frequency-vs3.46 GHz
System Bus 1333 MHzvs-
Max TDP65 Wvs73 W
Lithography45 nmvs32 nm
Bit Width64 Bitvs64 Bit
Max Temperature76.3°Cvs73°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size256 KBvs128 KB
L2 Cache Size4096 KBvs512 KB
L2 Cache Speed-vs-
L3 Cache Size-vs4 MB
Max Memory Size-vs16 GB
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsHD i5 650
Base GPU Frequency-vs733 MHz
Max GPU Frequency-vs-
DirectX-vs10
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size37.5mm x 37.5mmvs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewCore 2 Quad Q8400S 2.66GHz is a power efficient Processor based on the 45nm Core micro-architecture.

It offers 4 Physical Cores (4 Logical), clocked at 2.66GHz and 4MB of L2 Cache.
Among its many features, Virtualization is activated.

The processor DOES NOT integrate any graphics. and has a rated board TDP of 65W.

It offers average performance. It will therefore become a bottleneck in today's demanding games.
Core i5-650 3.2GHz is a performance CPU based on the 45nm, Nehalem architecture.

It offers 2 Physical Cores (4 Logical), initially clocked at 3.2GHz, which may go up to 3.46GHz and 4MB of L3 Cache.
Among its many features, Hyper-Threading, Turbo Boost and Virtualization are activated.

The processor integrates very weak Graphics called Intel i5 650, with XX Execution Units, clocked at 733MHz which share the L2 Cache and system RAM with the processor.
Both the processor and integrated graphics have a rated board TDP of 73W.

It offers average performance. This means it will become a bottleneck in some demanding applications.