Product comparison · 2 laptops

Lenovo E520 + 78Y9363 vs Lenovo T420 + 45N6678

125specifications compared
28differ
97identical
11known for one product only

Key differences

Display diagonal
- E520 + 78Y9363:39.6 cm (15.6")
- T420 + 45N6678:35.6 cm (14")
Display resolution
- E520 + 78Y9363:1366 x 768 pixels
- T420 + 45N6678:1600 x 900 pixels
Display brightness
- E520 + 78Y9363:220 cd/m²
- T420 + 45N6678:250 cd/m²
Processor family
- E520 + 78Y9363:Intel® Core™ i3
- T420 + 45N6678:Intel® Core™ i7
Processor generation
- E520 + 78Y9363:2nd gen Intel® Core™ i3
- T420 + 45N6678:2nd gen Intel® Core™ i7
Processor model
- E520 + 78Y9363:i3-2310M
- T420 + 45N6678:i7-2620M
Processor frequency
- E520 + 78Y9363:2.1 GHz
- T420 + 45N6678:2.7 GHz
Processor cache
- E520 + 78Y9363:3 MB
- T420 + 45N6678:4 MB

Side by side

Differences highlightedShow differences only

Comparison of E520 + 78Y9363, T420 + 45N6678
136 specifications	A Lenovo E520 + 78Y9363 View product	B Lenovo T420 + 45N6678 View product
Display3 differ
Display diagonalDiffers	39.6 cm (15.6")	35.6 cm (14")
Display resolutionDiffers	1366 x 768 pixels	1600 x 900 pixels
HD typeKnown for one	Unknown — not stated by the source	HD+
Display brightnessDiffers	220 cd/m²	250 cd/m²
Contrast ratio (typical)Known for one	Unknown — not stated by the source	300:1
Processor7 differ
Processor familyDiffers	Intel® Core™ i3	Intel® Core™ i7
Processor generationDiffers	2nd gen Intel® Core™ i3	2nd gen Intel® Core™ i7
Processor modelDiffers	i3-2310M	i7-2620M
Processor boost frequencyKnown for one	Unknown — not stated by the source	3.4 GHz
Processor frequencyDiffers	2.1 GHz	2.7 GHz
Processor cacheDiffers	3 MB	4 MB
Processor seriesDiffers	Intel Core i3-2300 Mobile Series	Intel Core i7-2600 Mobile Series
CPU multiplier (bus/core ratio)Differs	21	27
Storage1 differ
HDD speedDiffers	5400 RPM	7200 RPM
Graphics2 differ
Discrete graphics card modelDiffers	Intel® HD Graphics	Intel® HD Graphics 3000
On-board graphics card dynamic frequency (max)Differs	1100 MHz	1300 MHz
Network1 differ
Mobile network connectionKnown for one	Unknown — not stated by the source	Yes
Mobile network generationKnown for one	Unknown — not stated by the source	3G
BluetoothDiffers	Yes	No
Bluetooth versionKnown for one	3.0+HS	Unknown — not stated by the source
Ports & interfaces1 differ
DisplayPorts quantityKnown for one	Unknown — not stated by the source	1
Docking connectorDiffers	No	Yes
HDMI ports quantityKnown for one	1	Unknown — not stated by the source
Performanceidentical
Motherboard chipsetKnown for one	Unknown — not stated by the source	Intel® QM67 Express
Processor special features7 differ
Intel Trusted Execution TechnologyDiffers	No	Yes
Intel Virtualization Technology for Directed I/O (VT-d)Differs	No	Yes
Intel® AES New Instructions (Intel® AES-NI)Differs	No	Yes
Intel® Turbo Boost TechnologyDiffers	No	2.0
Processor ARK IDDiffers	52220	52231
Processor codeDiffers	SR04S	SR041
Processor package sizeDiffers	37.5 x 37.5 xrPGA988B); 31 x 24 (BGA1023)	37.5 x 37.5 (rPGA988B); 31 x 24 (BGA1023)
Battery1 differ
Battery life (max)Differs	6.2 h	9 h
Securityidentical
Fingerprint readerKnown for one	Unknown — not stated by the source	Yes
Weight & dimensions5 differ
WeightDiffers	2.4 kg	2.2 kg
WidthDiffers	380 mm	340.5 mm
DepthDiffers	248.5 mm	233 mm
Height (front)Differs	2.93 cm	3.01 cm
Height (rear)Differs	3.37 cm	3.05 cm
Other featuresidentical
Supplied AC adapter typeKnown for one	AC	Unknown — not stated by the source

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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