The Mac Pro "Quad Core" 3.2 (Mid-2012/Nehalem) is powered by a single 3.2 GHz Quad Core 45-nm Xeon W3565 (Nehalem) processor with a dedicated 256k of level 2 cache for each core and 8 MB of "fully shared" level 3 cache. By default, it is configured with 6 GB of 1066 MHz DDR3 ECC SDRAM, a 1 TB (7200 RPM, 32 MB cache) 3Gb/s Serial ATA hard drive, an 18X dual-layer "SuperDrive" and an ATI Radeon HD 5770 graphics card with 1 GB of 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), and four PCIe 2.0 slots (one free PCIe 2.0 x16 slot and two free PCIe 2.0 x4 slots with the default single graphics card installed). Ports include five USB 2.0 ports, four Firewire "800" ports, dual Gigabit Ethernet, two Mini DisplayPorts and a dual-link DVI port, among others. AirPort Extreme (802.11a/b/g/n) and Bluetooth 2.1+EDR is standard.