The Mac Pro "Eight Core" 2.4 (Mid-2010/Westmere) is powered by dual 2.4 GHz Quad Core 45-nm Xeon E5620 (Westmere) processors with a dedicated 256k of level 2 cache for each core and 12 MB of "fully shared" level 3 cache per processor. Via custom configuration it also could be equipped with two 2.66 GHz Six Core Intel Xeon X5650 processors or two 2.93 GHz Six Core Intel Xeon X5670 processors for a total of twelve cores for either model. Because of additional technical differences, EveryMac.com has documented these custom configurations as their own models. By default, this model was 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.