Originally Posted by sakor1
Sorry I was not more specific, I am speaking from the perspective of how Dell supplies these. They generally do not use an iteration of the 'GM' chipsets and include an AGP/PCI-E graphics slot with it. For this they use the 'PM' iterations.
Why? Because it is a cost saving feature: the boards that have these slots and features on them are more expensive... if they used them they would have to subsidise that cost with a higher selling price. By using the two iterations seperately and making them mutually exclusive, they are able to offer two 'different' models (i6000, i6000d/ i6400, i6400d) at different price points... using 90% of the same components.
Volume and cheap manufacturing/ development costs is how Dell keeps the prices low to consumers.
The original question on the thread (to paraphrase) was: 'What's the downside to buying an Inspiron 6400? Is it the integrated graphics?'
To which people responded about possible bad resale value because of lack of a graphics upgrade option. This observation was false.
The 6400 is, I repeat is, upgradeable to discrete (dedicated) graphics.