Technical Details

Operating system: Windows 7 Professional 64 (available through downgrade rights from Windows 8.1 Pro 64)
(This system is preinstalled with Windows 7 Professional software and also comes with a license and media for Windows 8.1 Pro software. You may only use one version of the Windows software at a time. Switching between versions will require you to uninstall one version and install the other version. You must back up all data (files, photos, etc.) before uninstalling and installing operating systems to avoid loss of your data.)
Processor family: Intel® Xeon® E5 processor
Processor: Intel® Xeon® E5-1603 v3 (2.8 GHz, 10 MB cache, 4 cores, Intel® vPro™)
Chipset: Intel® C612
Environmental: Low halogen
Form factor: Minitower
Memory, standard: 8 GB 2133 MHz DDR4 ECC Registered RAM (1 x 8 GB)
Memory slots: 8 DIMM
Internal drive bays: Two 3.5″
External drive bays: Two 5.25″; One slim ODD
Internal drive: 1 TB 7200 rpm SATA
Additional storage: 1 15-in-1 media card reader
Storage controller: Integrated SATA 6.0 Gb/s; LSI MegaRAID® 9270-8i SAS 6.0 Gb/s ROC RAID Card and iBBU09 Battery Backup Unit (optional); LSI 9217-4i4e 8-port SAS 6.0 Gb/s RAID (optional); Factory integrated RAID available for SATA/SAS drives (RAID 0, 0 Data, 1, and 10)
Optical drive: Slim SATA SuperMulti DVD writer