I have a GeForce GTX 285M in my notebook* and it works well enough - can play anything I've thrown at it on high quality settings.
Er... not that I've thrown a great deal at it recently.
I mean, Minecraft is the newest game it has seen, which doesn't exactly challenge it.
But it runs UT3, STALKER, Mount & Blade, Fallout 3 all with no problems.
( *It's not a
laptop because it's over 5KG and would flatten your lap.
)