The Power Macintosh G5/2.7 DP (PCI-X) features dual 2.7 GHz PowerPC 970fx (G5) processors each with an optimized AltiVec "Velocity Engine" vector processing unit and 512k level 2 on-chip cache. 2048 MB 400 MHz PC3200 DDR SDRAM, a 250.0 GB (7200 RPM) Serial ATA hard drive, a 16X DVD+R DL/DVD RW/CD-RW "SuperDrive", and an ATI Radeon 9650 (AGP 8X Pro) video card with 256 MB of DDR SDRAM. Connectivity includes USB 2.0, FireWire "400" and "800", one single-link DVI and one dual-link DVI port (no ADC port), and optical digital audio in/out. This model includes support for PCI-X. Like the earlier models, the Power Macintosh G5/2.7 DP (PCI-X) uses the same "anodized aluminum alloy" case, and likewise, features a removable side panel for easy access to internal components and is divided into four different thermal zones with nine computer-controlled fans for optimum cooling