IBM ThinkPad T42 vs Lenovo ThinkPad T420

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ThinkPad T42 compared with ThinkPad T420

	IBMThinkPad T42	LenovoThinkPad T420
Overview
Released
Released	May 2004	March 2011
Display
Screen size
Screen size	14.1″	14″
Resolution
Resolution	1400 × 1050 (better)	1366 × 768 or 1600 × 900
Brightness
Brightness	150 nits	200 nits or 250 nits (better)
Touchscreen
Touchscreen	No	No
Display type
Display type	Listed US 2373-3UU has 14.1-inch active-matrix TFT SXGA+ LCD, 150 nits; native refresh and panel subtype unpublished. Other original models offered 14.1-inch XGA, or a separate 15-inch chassis	14-inch 1366 × 768 (200 nits) or 1600 × 900 (250 nits) LED-backlit LCD; 300:1 contrast
Screen finish
Screen finish	–	Anti-glare
Performance
Processor
Processor	Intel Pentium M 735	Intel Core i5-2520M
CPU cores
CPU cores	1	2
CPU threads
CPU threads	1	4
Graphics
Graphics	ATI Mobility Radeon 9600	Intel HD Graphics 3000 or NVIDIA NVS 4200M
Memory
Memory	512 MB	4 GB (better)
Storage
Storage	40 GB	128 GB to 500 GB (better)
CPU
CPU	Listed Pentium M 735 at 1.7 GHz, 400 MHz system bus and 2 MB on-die ECC L2 cache; other original configurations used Pentium M 745 at 1.8 GHz	Second-generation Intel Core i3, i5 and i7 dual-core processors; QM67 chipset
GPU
GPU	Listed ATI Mobility Radeon 9600, AGP 4X with 64 MB DDR graphics memory; XGA configurations instead offered Radeon 7500 with 32 MB	Integrated Intel HD Graphics 3000; optional NVIDIA NVS 4200M with 1 GB and Optimus
Memory type
Memory type	Listed 512 MB PC2700 DDR-333 CL2.5 in one socket; two 200-pin SO-DIMM sockets and 2 GB maker maximum	DDR3-1333; two SO-DIMM sockets, up to 8 GB
Storage type
Storage type	Listed 40 GB 5400 rpm Enhanced IDE removable hard drive, 9.5 mm high, with Active Protection System; DVD-ROM/CD-RW combo in removable 9.5 mm Ultrabay Slim. Other configurations had DVD-ROM, DVD writer or 80 GB disk	Removable 2.5-inch SATA HDD or SSD; removable Ultrabay Enhanced DVD burner; optional second drive adapter
Battery and size
Battery life (maker's claim)
Battery life (maker's claim)	Up to 4.6 hours	Up to 9 hours
Battery capacity
Battery capacity	–	57 Wh
Weight
Weight	2.3 kg	2.2 kg (better)
Thickness
Thickness	31.4 mm	30.5 mm (better)
Width × depth
Width × depth	311 × 255 mm	340.5 × 233 mm
Battery life detail
Battery life detail	Six-cell lithium-ion battery, maker maximum 4.6 hours; optional nine-cell up to 7.5 hours, or nine-cell plus Ultrabay Slim battery up to 9.5 hours. Headline 2.3 kg is SXGA+ model weight including optical drive and battery; XGA models are 2.2 kg. Height spans 26.6–31.4 mm, maximum listed	MobileMark 2007: integrated graphics, six-cell 57 Wh up to 9 hours, nine-cell 94 Wh up to 15 hours, nine-cell plus slice up to 30 hours; Optimus up to 8.8 / 14.7 / 29.5 hours; four-cell option; weight shown with six-cell battery
Charger
Charger	Universal 72 W AC adapter	65 W; 90 W on Optimus models
Materials
Materials	–	Carbon-fibre/glass-fibre hybrid display cover; carbon-fibre reinforced plastic bottom; magnesium roll cage
Colours
Colours	Black	Black
Connections
Ports
Ports	2 × USB-A, Ethernet, headphone jack	4 × USB-A, Ethernet, SD card slot, headphone jack
Wi-Fi
Wi-Fi	802.11a/b/g, Atheros AR5001X+ on listed US 2373-3UU	802.11b/g/n or 802.11a/b/g/n
Bluetooth
Bluetooth	Bluetooth, version unpublished in original PSREF	Optional Bluetooth 3.0
Webcam
Webcam	No built-in webcam listed	Optional 720p
Operating system
Operating system	Windows	Windows
Port detail
Port detail	Two USB 2.0, Gigabit RJ-45, parallel, VGA, 4 Mbps infrared, RJ-11 modem, S-video, separate microphone/headphone jacks; two Type I/II or one Type III CardBus PC Card slots. Docking accessories optional	Three USB 2.0 (one powered), one USB 2.0/eSATA combo, VGA, DisplayPort, Gigabit Ethernet, audio combo, 4-in-1 SD reader and ExpressCard/34; optional modem, FireWire and smart card reader
External displays
External displays	–	Up to 2560 × 1600 at 60 Hz via DisplayPort; 2048 × 1536 at 75 Hz via VGA; Optimus variants support three independent displays
Keyboard
Keyboard	87-key keyboard with Access IBM button, 19 mm pitch and 2.5 mm travel; ThinkLight keyboard illumination	Seven-row spill-resistant keyboard; TrackPoint; ThinkLight overhead illumination
Trackpad
Trackpad	UltraNav touchpad and TrackPoint with Press-to-Select, scrolling and magnifying glass	UltraNav multi-touch touchpad
Speakers
Speakers	Stereo 1 W speakers with dedicated volume and mute buttons	1 W × 2 stereo speakers
Microphones
Microphones	Internal microphone and separate microphone input	Dual-array microphone
Biometrics
Biometrics	IBM Embedded Security Subsystem 2.0, TCG compliant; power-on, supervisor and hard-drive passwords. Original listed May2004 configuration does not include the later fingerprint-reader revision	Optional swipe fingerprint reader; TPM 1.2