Thanks for teh replies guys, So its for a customer of mine.
He has given me an old Alienware laptop which he wants to repair, it wasn't booting and no display on the screen. It came with a 340M in it, so had a spare 240M which we put in and the laptop is now working.
So i explained that its really not worth the trouble to upgrade but he is adamant that we must put a 1060 in there.