MusicXPC has introduced two new models, the Professional C3 and Professional C4. These Windows XP-based machines feature Pentium 4 processors with 800MHz front-side buses running at 3.0 and 3.2GHz respectively. FireWire, USB 2.0, PCI, 8x AGP, and S/PDIF ports are standard. Dual SATA drives are provided for best audio performance.