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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).

Architecture

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.

Performance 

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.

Graphics

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
CodenameBroadwell
Series: Core M Broadwell
Intel Core M-5Y71 compare1.2 - 2.9 GHz2 / 44 MB
Intel Core M-5Y51 compare1.1 - 2.6 GHz2 / 44 MB
Intel Core M-5Y70 compare1.1 - 2.6 GHz2 / 44 MB
» Intel Core M-5Y310.9 - 2.4 GHz2 / 44 MB
Intel Core M-5Y10c compare0.8 - 2 GHz2 / 44 MB
Intel Core M-5Y10a compare0.8 - 2 GHz2 / 44 MB
Intel Core M-5Y10 compare0.8 - 2 GHz2 / 44 MB
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
SocketFCBGA1234
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
Architecturex86
Announcement Date12/01/2014
Product Link (external)Intel Core M 5Y31

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* Smaller numbers mean a higher performance

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Reviews for the Intel Core M 5Y31 processor

Apple MacBook 12 (Early 2015) 1.1 GHz (Intel HD Graphics 5300, 12.00")
» Apple MacBook 12 (Early 2015) Notebook Preview - Review
» Apple MacBook 12 (Early 2015) 1.1 GHz Review - Review
» Apple MacBook 12 (Early 2015) 1.1 GHz - External Review

Fujitsu Stylistic Q665 (Intel HD Graphics 5300, 11.60")
» Fujitsu Stylistic Q665 Tablet Review - Review
» Fujitsu Stylistic Q665 - External Review

Samsung 930X2K-K02US (Intel HD Graphics 5300, 12.20")
» Samsung 930X2K-K02US - External Review

Toshiba Portege Z20t-B-10E (Intel HD Graphics 5300, 12.50")
» Toshiba Portege Z20t-B-10E - External Review

» Mobile CPU Comparison
Comparison of all mobile CPU series

» Mobile Processors - Benchmarklist
Benchmarklist of all known CPUs that are used in laptops (desktop and laptop CPUs)

Other CPUs of the series Core M

» Intel Core M-5Y71
   2x 1.2 GHz - 2.9 GHz
» Intel Core M-5Y51
   2x 1.1 GHz - 2.6 GHz
» Intel Core M-5Y70
   2x 1.1 GHz - 2.6 GHz
» Intel Core M-5Y31
   2x 0.9 GHz - 2.4 GHz
» Intel Core M-5Y10c
   2x 0.8 GHz - 2 GHz
» Intel Core M-5Y10a
   2x 0.8 GHz - 2 GHz
» Intel Core M-5Y10
   2x 0.8 GHz - 2 GHz

Surrounding CPUs

+ Intel Celeron 3865U
   2x 1.8 GHz
+ AMD FX-7500
   4x 2.1 GHz - 3.3 GHz
+ Qualcomm Snapdragon 850
   8x 2.96 GHz
+ AMD A10 Pro-7350B
   4x 2.1 GHz - 3.3 GHz
+ Intel Celeron 1020E
   2x 2.2 GHz
» Intel Core M-5Y31
   2x 0.9 GHz - 2.4 GHz
- AMD 3015e
   2x 1.2 GHz - 2.3 GHz
- Intel Celeron N4120
   4x 1.1 GHz - 2.6 GHz
- Intel Core M-5Y10c
   2x 0.8 GHz - 2 GHz
- Intel Core M-5Y10a
   2x 0.8 GHz - 2 GHz
- AMD Phenom II X4 X920 BE
   4x 2.3 GHz
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Klaus Hinum (Update: 2014-11- 1)