Intel Core i5 2557M 

Released June, 2011
  • 1.7 GHz
  • Dual core

The core features were targeting a 2:1 ratio of performance to power, which would require new features and updates to improve performance by at least 2x while maintaining power levels.
by Ryan-Shrout (Aug, 2014)
The T300 Chi was specified as a 12.5-inch fanless tablet in a 7.3mm thickness design, with LTE support and a 2560x1600 display.
by Ian-Cutress (Sep, 2014)

Benchmarks Real world tests of the Intel Core i5 2557M

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i5 2557M

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i5 2557M

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i5 2557M
1,780,000 MB/s
Core2 Duo T9600
114,200 MB/s
Core i5 3437U
1,795,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i5 2557M

GeekBench (64-bit) Data courtesy Primate Labs

Core i5 2557M


Core i5 2557M

PassMark Data courtesy Passmark

Core i5 2557M

PassMark (Single Core)

Core i5 2557M

In The News From around the web


Intel’s erratic Core M performance leaves an opening for AMD

by Joel Hruska |
Instead of absolutely guaranteeing that a chip will reach a certain speed at a given temperature or power consumption level, simply establish that frequency range as a “maybe” and push the issue off on OEMs or enthusiasts to deal with.
In several cases, the gaps in both CPU and GPU workloads are quite significant — and favor the slower processor.
Though not a performance powerhouse, I think the first taste of Broadwell is delectable and provides vendors with an amazing option that balances the performance of Haswell with the power efficiency of Bay Trail and the Atom lineup.
Newly branded as the Core M line, Broadwell-Y is meant to target the market looking for similar performance of today's ultra-low voltage Haswell processors but with longer battery life and more efficient designs.

More Intel Core M Coming Q4

by Ian Cutress |
All new CPUs are slated for a Q4 launch, which would mean that they might become available for end users in products on the shelf sometime in Q1 2015.
These initial CPUs should be properly available to the public in Q4 in devices such as the Lenovo Yoga 3 Pro using the Core M-5Y70.
One of the main graphs Intel was pushing in their briefing was this one, indicating what power is required for a fanless tablet.
With the 12.5-inch size and 7.3mm width, it sounds like the T300 Chi will be modifying the Core M CPU to be around 4W in order to keep the 41C skin temperature as a maximum.

Specifications Full list of technical specs


Clock speed 1.7 GHz
Turbo clock speed 2.7 GHz
Cores Dual core
Socket type BGA 1023
Is unlocked No


Has a NX bit Yes
Supports trusted computing Yes
Has virtualization support Yes
Instruction set extensions
  1. MMX
  2. AES
  3. SSE
  4. SSE2
  5. SSE4.1
  6. SSE3
  7. Supplemental SSE3
  8. SSE4.2
  9. AVX
  10. SSE4
Supports dynamic frequency scaling Yes

power consumption

Annual home energy cost 4.1 $/year
Performance per watt 41.57 pt/W
Typical power consumption 13.81W


Architecture DMI
Transfer rate 5,000 MT/s


Architecture x86-64
Threads 4 threads
L2 cache 1 MB
L2 cache per core 0.5 MB/core
L3 cache 3 MB
L3 cache per core 1.5 MB/core
Manufacture process 32 nm
Max CPUs 1
Clock multiplier 17
Operating temperature Unknown - 100°C


Overclocked clock speed 2.4 GHz
Overclocked clock speed (Water) 1.7 GHz
Overclocked clock speed (Air) 2.4 GHz

integrated graphics

Label Intel® HD Graphics 3000
Number of displays supported 2
GPU clock speed 350 MHz
Turbo clock speed 1,200 MHz

memory controller

Memory controller Built-in
Memory type
  1. DDR3-1333
  2. DDR3-1066
  3. DDR3
Channels Dual Channel
Supports ECC No
Maximum bandwidth 21,333.32 MB/s
Maximum memory size 8,202.24 MB
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