The Mac Pro "Eight Core" 2.8 (Early 2008) is powered by two 2.8 GHz Quad Core 45-nm Intel Xeon E5462 (Harpertown/Penryn) processors with 14 MB of level 2 cache per processor (each pair of cores shares 6 MB), a 128-bit SSE4 SIMD vector engine, and 1.6 GHz "64-bit dual independent frontside buses."

The unit is configured with 14 GB of 800 MHz DDR2 EEC "fully-buffered" FB-DIMM memory, a 320 GB (7200 RPM, 8 MB cache) 3Gb/s Serial ATA hard drive, a double-layer 16X "SuperDrive", and an ZOTAC GEFORCE GTX 680 video card with 2 GB 256 BIT GDDR5 memory. 

Expansion includes two external 5.25" "optical" bays (one free by default), four internal 3.5" "cable-free, direct attach" hard drive bays (three free by default), two PCIe x4 slots, and two PCIe 2.0 x16 slots (one free with one graphics card installed). Ports include dual Gigabit Ethernet, five USB 2.0 ports, two Firewire "400" ports, two Firewire "800" ports, and optical digital audio in/out, among others. Bluetooth 2.0+EDR is standard, AirPort Extreme (802.11g/n) and a modem are optional.

Compared to the original Mac Pro that it replaced, the Mac Pro "Eight Core" 2.8 uses a more advanced architecture with faster and more efficient processors with larger level 2 caches, a more advanced vector engine, faster frontside buses (1.6 GHz instead of 1.33 GHz), faster memory (800 MHz instead of 667 MHz), support for optional faster Serial Attached SCSI drives (with the installation of the Mac Pro RAID card), and two 16-lane PCIe 2.0 slots.

Includes a 1 TB hard drive and the original 320 GB hard drive.

Includes 1 - ZOTAC GEFORCE GTX 680 video card with 2 GB 256 BIT GDDR5 memory. Pre-installed. 

Includes power cord. 

Does Not Include, monitor, keyboard, mouse or any other peripherals.

There are very minor scratches and nicks that are present due to normal wear, but the unit was well taken care of and is in very good condition.