Are these good graphics cards? Which ones can game?

I have 3 computers, and i’ve been looking into becoming a gamer. One of my computers has a ATI Radeon Mobility 2600 XT, one has a NVIDIA GeForce 740, and one has Intel HD Graphics 6000

Can any of these game? why or why not?
Update: Geforce GT 740, Radeon Mobility 2600 XT, or Intel HD Graphics 6000?
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