Out of curiosity, could you give a reason why you want to replace the board? If it is the lack of an AGP slot, you could just replace your board with another one from a different Dell Dimension that came inside the same case style. For example, you 2350 uses the same case design as the Dimension 2400, 3000, 4600, 1100, and B110. Out of those, the 4600 has an agp slot, and an 865 chipset supporting 800 MHz fsb and hyperthreading P4's, which might support Prescott socket 478 cpus, and supports dual channel pc3200 DDR ram. It should be a 100% compatible motherboard, meaning no connecter modifications and no worrying about windows XP not installing (all Dell windows XP CDs will work on any Dell). The 4600 mobo can usually be found on E-bay for around $50.