Do the new Quadro FX solutions support 30-bit color displays like the HP DreamColor lp2480zx?

Yes. All NVIDIA Quadro FX professional solutions for Windows platforms from the FX 580 GPU and up have integrated support for 30-bit color (10-bit color per color channel) to take advantage of all 30-bit display monitors. The Quadro FX 4800 for MAC does not have a Display Port connector, thus does not support 30-bit color displays.