Operating temperature: 50° to 95° F (10° to 35° C).Current: Maximum of 12A (low-voltage range) or 6A (high-voltage range).Line voltage: 100-120V AC or 200-240V AC (wide-range power supply input voltage).One open optical drive bay for optional second SuperDrive.Writes CD-R and CD-RW discs at up to 32x speed.
Writes DVD+R DL and DVD-R DL discs at up to 8x speed. Writes DVD+R and DVD-R discs at up to 18x speed. 18x SuperDrive with double-layer support (DVD±R DL/DVD±RW/CD-RW). Optional Mac Pro RAID Card with 512MB cache and 72-hour cache battery backup. 1TB or 2TB Serial ATA 3Gb/s, 7200 rpm, 32MB cache. 640GB Serial ATA 3Gb/s, 7200 rpm, 16MB cache. Up to 8TB of internal storage 3 in hard drive bays 1 through 4 using hard drives in the following capacities:. Four 3.5-inch cable-free, direct-attach hard drive bays with built-in independent 3Gb/s Serial ATA channels four internal hard drive carriers included. Optional AirPort Extreme 802.11n Wi-Fi wireless networking card 2 IEEE 802.11a/b/g compatible. Bluetooth 2.1 + Enhanced Data Rate (EDR). Two independent 10/100/1000BASE-T Ethernet (RJ-45) interfaces with support for jumbo frames. VGA output using Mini DisplayPort to VGA Adapter or DVI to VGA Display Adapter (optional). Additional dual-link DVI output using Mini DisplayPort to Dual-Link DVI Adapter (optional). Additional DVI output using Mini DisplayPort to DVI Adapter (optional). Support for analog resolutions up to 2048 by 1536 pixels. Support for digital resolutions up to 2560 by 1600 pixels. Support for up to eight 30-inch displays 1. Multiple graphics card configurations available with two, three, or four NVIDIA GeForce GT 120 cards. ATI Radeon HD 4870 with 512MB of GDDR5 memory, PCI Express 2.0, one Mini DisplayPort, and one dual-link DVI port. 
NVIDIA GeForce GT 120 with 512MB of GDDR3 memory, PCI Express 2.0, one Mini DisplayPort, and one dual-link DVI port.
Double-wide, 16-lane PCI Express 2.0 graphics slot with one of the following graphics cards installed:. Quad-core: Four memory slots supporting up to 16GB of main memory using 1GB, 2GB, or 4GB DIMMs. 8-core: Eight memory slots (four per processor) supporting up to 32GB of main memory using 1GB, 2GB, or 4GB DIMMs. Hyper-Threading technology for up to 16 virtual cores. Turbo Boost dynamic performance (up to 3.33GHz on 8-core 2.93GHz system, up to 3.6GHz on quad-core 3.33GHz system). 8MB of fully shared 元 cache per processor. Next-generation Intel microarchitecture. Quad-core: One 2.66GHz, 2.93GHz, or 3.33GHz Quad-Core Intel Xeon 3500 series processor. 8-core: Two 2.26GHz, 2.66GHz, or 2.93GHz Quad-Core Intel Xeon 5500 series processors.
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