I just recently bought a second 650M for my Y400. I've ordered the 170 W brick, but it hasn't arrived yet. I've got the second card swapped in to my laptop with the original 120 W brick at the moment, but my laptop doesn't even seem to recognize that the second card is there. It generates heat, so I know that it's turned on, but there aren't any SLI settings to be accessed in my nvidia control panel. So my question is - does the second card need the 170 watt brick to function at all? Is my problem going to be fixed with the 170 W brick, or is something else to issue here?