well hp is allowing the 8400m to be in there 14.1 to 17 inch line up. And my platform should be compatible.. ther is plenty of cooling. cpu and gpu have a partaily shared fan. with 2 inlets and two exhast fans. it cools well but not lap friendly. gets sligtly hot in the corner with both the gpu and cpu. I m sorta gald i went witht eh hp even though i would of loved the 9750. the hp is a sleek sexy machine. with some power under the hood.
and right now im on battery and taping onto networks in the car ona trip." very nice!"
The 8400 is not a high end card.
As far as cooling goes, the capacity of the heatsink/fan is important. There's a reason AW doesn't offer the m5550 with a 7950gtx in there...