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Intel Core M-5Y31

Intel 5Y31

The Intel Core M-5Y31 is an ULV (ultra-low voltage) dual-core SoC based on the Broadwell architecture launched in late 2014. Thanks to its TDP of just 4.5 W (configurable), the CPU is suited for passively cooled tablets and 2-in-1 notebooks. In addition to two CPU cores with Hyper-Threading clocked at 0.9 - 2.4 GHz, the chip also integrates an HD Graphics 5300 GPU and a dual-channel LPDDR3/DDR3L(-RS) memory controller up to 25.6 GB/s. The chip is manufactured in a 14 nm process with FinFET transistors.

Using the "configurable TDP" feature, the 5Y31 can be clocked at 1.1 GHz base clock at a higher TDP (it seems like Apple is using this feature in the base model of the 12-inch MacBook Retina 2015).


Broadwell represents the "Tick" in Intel's Tick-Tock model, which means a shrink of its predecessor Haswell. The new 14 nm manufacturing process with three-dimensional FinFET transistors allows not only improvements in energy efficiency, but also a significantly smaller die size fit for more compact packages and devices.

Further advantages result from the revised microarchitecture of Broadwell. Due to its improved branch prediction, bigger buffer sizes (1500 instead of 1000 entries in the L2 TLB) and other tweaks, the performance per clock has been increased by more than 5 percent over its predecessor. There are also some new instruction set extensions designed for cryptographic applications.


The Core M-5Y31 offers a very wide turbo range from 0.9 - 2.4 GHz. However, the actual frequency is largely limited by the TDP. While the CPU is similar to a Core i5-4200U (Haswell, 15 W) in short benchmarks, its performance will begin to degrade under continuous full load. Accordingly, the main purpose of Broadwell's higher power efficiency is to reduce power consumption instead of improving raw performance.

Overall, the Core M-5Y31 will be sufficient for office and multimedia purposes as well as more demanding applications.


The integrated HD Graphics 5300 offers 24 Execution Units (EUs) clocked at 300 - 850 MHz. Similar to the CPU core, the GPU architecture (Intel Gen 8) has been thoroughly revised for improved performance-per-clock. However, the GPU frequency will be also limited by the TDP, which prevents significant performance boosts over the older HD 4200 under continuous 3D load. Current games as of 2014/2015 will be playable in lowest settings only.

Broadwell is the first Intel chip to fully support DirectX 11.2 as well as OpenCL 1.3/2.0 and OpenGL 4.3. Video will output natively via DisplayPort 1.2 or HDMI 1.4a. However, the new HDMI 2.0 standard is not officially supported.

Power Consumption

With a TDP of only 4.5 W, the Core M-5Y31 draws noticeably less power than the Haswell Y-series (11.5 W). However, the TDP can be set to different values such as 3.5 or 6 W, affecting clock rates and performance (6 W: 1.1 GHz base clock, 3.5 W: 0.6 GHz base clock). The CPU can be passively cooled even in thin tablets.

SeriesIntel Core M

Series: Core M Broadwell

Intel Core M-5Y71 compare1.2 - 2.9 GHz2 / 4 cores4 MB L3
Intel Core M-5Y51 compare1.1 - 2.6 GHz2 / 4 cores4 MB L3
Intel Core M-5Y70 compare1.1 - 2.6 GHz2 / 4 cores4 MB L3
Intel Core M-5Y31 « 0.9 - 2.4 GHz2 / 4 cores4 MB L3
Intel Core M-5Y10c compare0.8 - 2 GHz2 / 4 cores4 MB L3
Intel Core M-5Y10a compare0.8 - 2 GHz2 / 4 cores4 MB L3
Intel Core M-5Y10 compare0.8 - 2 GHz2 / 4 cores4 MB L3
Clock Rate900 - 2400 MHz
Level 1 Cache128 KB
Level 2 Cache512 KB
Level 3 Cache4 MB
Number of Cores / Threads2 / 4
Power Consumption (TDP = Thermal Design Power)4.5 Watt
Transistor Count1300 Million
Manufacturing Technology14 nm
Die Size82 mm2
Max. Temperature95 °C
FeaturesHD Graphics 5300 (300 - 850 MHz), Dual-Channel DDR3L(-RS)/LPDDR3 Memory Controller (max. 800 MHz, 25.6 GB/s), HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI
GPUIntel HD Graphics 5300 (300 - 850 MHz)
64 Bit64 Bit support
Announcement Date12/01/2014
Product Link (external)


Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
min: 148     avg: 193.8     median: 208 (1%)     max: 211 Points
Cinebench R11.5 - Cinebench R11.5 CPU Multi 64 Bit
min: 1.67     avg: 2.1     median: 2.2 (3%)     max: 2.3 Points
Cinebench R11.5 - Cinebench R11.5 CPU Single 64 Bit
min: 0.93     avg: 1.1     median: 1.1 (27%)     max: 1.15 Points
3DMark 11 - 3DM11 Performance Physics
min: 1290     avg: 1739     median: 1738.5 (5%)     max: 2187 Points
3DMark - 3DMark Ice Storm Physics
min: 21639     avg: 24195     median: 24194.5 (20%)     max: 26750 Points
3DMark - 3DMark Fire Strike Standard Physics
min: 2662     avg: 3012     median: 3012 (5%)     max: 3362 Points
Geekbench 3 - Geekbench 3 32 Bit Multi-Core
min: 3476     avg: 3821     median: 3821 (7%)     max: 4166 points
Geekbench 3 - Geekbench 3 32 Bit Single-Core
min: 2088     avg: 2179     median: 2179 (43%)     max: 2270 points
Mozilla Kraken 1.1 - Kraken 1.1 Total Score *
min: 2661     avg: 2874     median: 2873.5 (3%)     max: 3086 ms
Sunspider - Sunspider 1.0 Total Score *
min: 145     avg: 183.5     median: 183.5 (2%)     max: 222 ms
Octane V2 - Octane V2 Total Score
min: 10827     avg: 13363     median: 13362.5 (12%)     max: 15898 Points
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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