And they still take batteries filled with 18650 cells, my understanding is batteries with 18650 cells age batter than modern flat batteries. but win over T450, possibly even over T470. T530/T430/W530 would need a classic keyboard installed Now if you look at you will notice that these 4-core Ivy Bridge CPU-s are quite powerful. T520/T420/W520 would need Coreboot installed.

T520/T530/T420/T430/W520/W530 (and X220/X230 with a specially purchased $150 mobo from Aliexpress, special mobo because CPU is soldered) can all run 4-core Ivy bridge CPU-s. I don't know W540 but from the post above it looks like W540 can deliver more omph than T440p. It can even take latest IGZO power-efficient screens. T440p is quite famous on its upgrading capabilities. Ha ha, that's $1m question! Best of all time Well if you want the best power I assume the latest models are the best! What is the best Lenovo laptop of all time, as far as options of beefing it up/ speed/ power