This Mac Pro Xeon Eight Core 2.8 (Early 2008) is powered by two 2.8 GHz Quad Core 45-nm Intel Xeon E5462 (Harpertown/Penryn) processors with 12 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." It is configured with: - 22 GB of 800 MHz DDR2 EEC "fully-buffered" FB-DIMM memory - 1TB (7200 RPM, 8 MB cache) 3Gb/s Serial ATA hard drive - 256 GB HyperX Kingston SSD drive via PCIEx16 - double-layer 16X "SuperDrive" - NVIDIA GTX 960 with 2047 MB GPUwith 3x Display ports, 1x dual-link DVI port, and 1x HDMI port - AirPort Extreme (802.11g/n) Expansion includes one 5.25" optical bay, three internal 3.5" cable-free, direct attach hard drive bays, and two PCIe x4 slots. 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. Makes for a great build server, a 1080p editing suite, or pro audio editing suite. Note - OSX installed is 10.11.6 El Capitan. Note II - Sorry for the "dusty" photos, machine will be cleaned before pickup.