Dell 6U214 Dimension 4550 Motherboard Dell Part Number: 6U214 Compatible with the following laptop model: Dimension 4550 Specifications: INTEL 845PE Chipset. Socket 478. (Supports P4 UP TO 2.6ghz). 2 DDR Memory Slots (Supports up to 1GB.) AGP Video Card Slot. 4 PCI Slots Comes with a 90 Day Replacement Warranty