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Compare Lenovo ThinkPad T420s vs. Lenovo ThinkPad T440s

This is a side-by-side comparison of the specs of the ThinkPad T420s vs. the ThinkPad T440s. Differences are highlighted in yellow.
Item ThinkPad T420s ThinkPad T440s
Item image Item image
Screen size 14" [x] 14" [x]
Maximum RAM 16GB [x] 12GB [x]
CPU i7-2620M [x] / i5-2450M [x] / i5-2410M [x] / i3-2310M [x] / i7-2640M [x] / i5-2540M [x] / i5-2520M [x] i7-4600U [x] / i5-4300U [x] / i5-4210U [x]
Release year 2011 [x] 2013 [x]
Screen brightness 250nt [x] (HD+ option) / 200nt [x] (HD option) 250nt [x] (HD+ option) / 200nt [x] (HD option) / 300nt [x] (FHD IPS option)
Battery capacity 43.2Wh [x] 72Wh [x] / 47.5Wh [x]
Weight 1.67kg [x] 1.59kg [x]
Power interface Coax barrel [x] Slim-tip (square plug) [x]
Graphics Intel HD Graphics 3000 [x] NVIDIA GeForce ® GT 720M [x] / Intel HD Graphics 4400 [x]
Resolution width 1366px [x] (HD option) / 1600px [x] (HD+ option) 1366px [x] (HD option) / 1600px [x] (HD+ option) / 1920px [x] (FHD IPS option)
Resolution height 768px [x] (HD option) / 900px [x] (HD+ option) 768px [x] (HD option) / 900px [x] (HD+ option) / 1080px [x] (FHD IPS option)
RAM interface Dual SODIMM slot [x] Single SODIMM slot [x]
Screen type TN [x] TN [x] / IPS [x] (FHD IPS option)
Colour Black [x] Black [x]
Storage format 2.5" 7mm SATA [x] 2.5" 7mm SATA [x]
Key travel 2.5mm [x]
PWM detected? Unknown [x] Yes [x]
Screen finish Matte [x] Matte [x]
Width 34.3cm [x] 33.1cm [x]
Depth 23cm [x] 22.6cm [x]
Height 2.6cm [x] 2.06cm [x]
Removable battery? Yes [x] Yes [x]
Supports Coreboot? Yes [x] No [x]
Backlit? No [x] Yes [x]
ThinkLight? Yes [x] No [x]
Trackpoint buttons Yes [x] No [x]
Card reader? SD [x] SD [x]
CPU architecture Sandy Bridge [x] Haswell [x]
Function row style Physical keys [x] Physical keys [x]
NFC? No [x] Optional [x]
Multitouch screen? Optional [x] (FHD IPS option)
Fingerprint reader? Optional [x] Optional [x]
Keyboard style 7 row [x] Chiclet (Island keys) [x]
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