ok i have a dell inspiron 6400 notebook with discrete video card namely nvidia geforce go 7300. so far as the specs say, the mobo is using the PCI Express X16 for the geforce go 7300 card.
so if i wanted to replace the video card with a GeForce GTX 285M that uses a PCI-E 2.0, is it even possible in the first place and if i can do so, will there be a degredation in the perfromance as compared to plugging it into a PCI-E 2.0.
Ooooold thread, but to answer your question:
No, because it is a notebook you cannot do this, mainly because of the following two reasons.
1. There is no GTX 285M card for the inspiron 6400
2. Heat; even if there would be a GTX 285M that would fit into your lappy, that card gets alot warmer than the 7300 and the cooling would not be sufficient.
As a general rule, you cannot replace GPUs in lappies. In the cases where it is possible, it is usually insanely expensive and not worth it unless you get a very good deal.