the magma pe6r4 expansion chassis features six easy-to-access pci-x slots that can be used to accommodate up to six pro tools® pci-based hd core, hd accel, and hd process cards. 4u rack-mount all steel enclosure pcie host interface card (x4); pci host interface card not available six pci-x slots (64-bit/66 mhz) fan provides optimal cooling within the ventilated enclosure two 1-meter, high-speed infiniband cables and power supply included supports apple's mac pro; windows support coming soon