What is the difference between 6000 and 6000d

The 6000 has integrated video and is not upgradeable. The 6000d has a PCI Express slot for an ATI X300 card - so far the only cards (they're available in different memory capacity) for that system.

The 6000d may be video upgradeable down the road, if Dell releases a compatible card. The 6000 cannot be upgraded.

thanks i ordered the d model.