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Gaming Performance Comparison

Recommended System Requirements
Game Core M 5Y31 Core i7-660UM 2-Core 1.33GHz
Cyberpunk 2077 222% 244%
Assassins Creed: Valhalla 333% 363%
Call of Duty: Black Ops Cold War 212% 233%
FIFA 21 201% 221%
Microsoft Flight Simulator 264% 289%
World of Warcraft: Shadowlands 400% 434%
Watch Dogs Legion 333% 363%
Horizon: Zero Dawn 264% 289%
Grand Theft Auto VI 429% 465%
Genshin Impact 144% 160%

In terms of overall gaming performance, the Intel Core M 5Y31 is marginally better than the Intel Core i7-660UM 2-Core 1.33GHz 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 M 5Y31 was released over three years more recently than the Core i7-660UM 2-Core, and so the Core M 5Y31 is likely to have far better levels of support, and will be much more optimized and ultimately superior to the Core i7-660UM 2-Core when running the latest games.

The Core M 5Y31 and the Core i7-660UM 2-Core both have 2 cores, and so are quite likely to struggle with the latest games, or at least bottleneck high-end graphics cards when running them. With a decent accompanying GPU, the Core M 5Y31 and the Core i7-660UM 2-Core may still be able to run slightly older games fairly effectively.

Both the Intel Core M 5Y31 and the Intel Core i7-660UM 2-Core 1.33GHz have the same number of threads. Both the Core M 5Y31 and the Core i7-660UM 2-Core use hyperthreading. The Core M 5Y31 has 2 logical threads per physical core and the Core i7-660UM 2-Core has 2.

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 M 5Y31 and Core i7-660UM 2-Core 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 i7-660UM 2-Core has a 0.43 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 M 5Y31 and the Core i7-660UM 2-Core have the same L2 cache size, and the same L3 cache size, so in terms of cache-related gaming performance, we have to look back to the clock rate, where the Core i7-660UM 2-Core wins out.

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 M 5Y31 has a 13 Watt lower Maximum TDP than the Core i7-660UM 2-Core, and was created with a 18 nm smaller manufacturing technology. What this means is the Core M 5Y31 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).

The Core M 5Y31 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 i7-660UM 2-Core, 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 M-5Y31, 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 CodenameBroadwellArrandale
MoBo SocketBGA 1234BGA 1288
Notebook CPUyesyes
Release Date05 Jan 201524 May 2010
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores2vs2
CPU Threads4vs4
Clock Speed0.9 GHzvs1.33 GHz
Turbo Frequency2.4 GHzvs2.4 GHz
Max TDP5 Wvs18 W
Lithography14 nmvs32 nm
Bit Width64 Bitvs64 Bit
Max Temperature95°Cvs105°C
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size128 KBvs128 KB
L2 Cache Size512 KBvs512 KB
L3 Cache Size4 MBvs4 MB
Max Memory Size-vs8 GB
Memory Channels-vs2
ECC Memory Supportnovsno
Comparison

CPU Graphics

GraphicsHD M-5Y31
Base GPU Frequency300 MHzvs-
Max GPU Frequency850 MHzvs-
DirectX12.0vs-
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 M 5Y31 is an Ultra Low Voltage, Mobile Processor, based on the 14nm Broadwell MicroArchitecture.

It offers 2 Physical Cores (4 Logical), Initially Clocked at 0.9GHz that go up to 2.4GHz, in Turbo Mode and 4MB of L3 Cache.
Among its many features, HyperThreading, Turbo Boost and Virtualization are activated.

The Processor Integrates Mildly Powerful Graphics called Intel HD M-5Y31, with 24 Execution Units, initially clocked at 300MHz and that go up to 850MHz, in Turbo Mode which share the L Caches and System RAM with the processor.
Both the processor and integrated graphics have a rated board TDP of 4.5W.

It offers average performance. This means it will become a bottleneck in some demanding applications.
Core i7-660UM 2-Core 1.33GHz is an ultra energy efficient mobile CPU based on the 32nm, Nehalem architecture.

It offers 2 Physical Cores (4 Logical), initially clocked at 1.33GHz, which may go up to 2.4GHz and 4MB of L3 Cache.
Among its many features, HyperThreading, Turbo Boost and Virtualization are activated.

The processor integrates very weak Graphics called Intel HD i7 660UM, with 10 Execution Units, initially clocked at 166MHz and that go up to 500MHz, in Turbo Mode which share the L2 Cache and system RAM with the processor.
Both the processor and integrated graphics have a rated board TDP of 18W.

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