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Compare Lenovo ThinkPad T420 vs. Lenovo ThinkPad T450s

This is a side-by-side comparison of the specs of the ThinkPad T420 vs. the ThinkPad T450s. Differences are highlighted in yellow.
Item ThinkPad T420 ThinkPad T450s
Item image Item image
Screen size 14" [x] 14" [x]
Maximum RAM 16GB [x] 12GB [x]
CPU i3-2310M [x] / i5-2410M [x] / i5-2450M [x] / i7-2620M [x] / i5-2520M [x] / i5-2540M [x] / i7-2640M [x] i7-5600U [x] / i5-5300U [x] / i5-5200U [x]
Release year 2011 [x] 2015 [x]
Screen brightness 250nt [x] (HD+ option) / 200nt [x] (HD option) 250nt [x] (HD+ option) / 300nt [x] (FHD IPS option)
Battery capacity 57Wh [x] / 94Wh [x] 23Wh [x] / 72Wh [x] / 48Wh [x]
Weight 2.11kg [x] 1.48kg [x]
Power interface Coax barrel [x] Slim-tip (square plug) [x]
Graphics Intel HD Graphics 3000 [x] NVIDIA GeForce 940M [x] / Intel HD Graphics 4400 [x] / Intel HD Graphics 5500 [x]
Resolution width 1366px [x] (HD option) / 1600px [x] (HD+ option) 1600px [x] (HD+ option) / 1920px [x] (FHD IPS option)
Resolution height 768px [x] (HD option) / 900px [x] (HD+ option) 1080px [x] (FHD IPS option) / 900px [x] (HD+ option)
RAM interface Dual SODIMM slot [x] Single SODIMM slot [x]
Screen type TN [x] IPS [x] (FHD IPS option) / TN [x] (HD+ option)
Colour Black [x] Black [x]
Storage format 2.5" 7mm SATA [x] 2.5" 7mm SATA [x] / M.2 [x]
Key travel 2.5mm [x]
PWM detected? Unknown [x] No [x] (FHD IPS option) / Unknown [x] (HD+ option)
Screen finish Matte [x] Matte [x]
Width 34.05cm [x] 33.1cm [x]
Depth 23.3cm [x] 22.6cm [x]
Height 3.05cm [x] 2.06cm [x]
ThinkLight? Yes [x] No [x]
Backlit? No [x] Yes [x]
Removable battery? Yes [x] Yes [x]
Trackpoint buttons Yes [x] Yes [x]
Supports Coreboot? Yes [x] No [x]
Card reader? SD [x] SD [x]
CPU architecture Sandy Bridge [x] Broadwell [x]
Function row style Physical keys [x] Physical keys [x]
Fingerprint reader? Optional [x] Optional [x]
Multitouch screen? Optional [x]
NFC? No [x] No [x]
Keyboard style 7 row [x] Chiclet (Island keys) [x]
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