Preinstalled:

• Windows 7 Ultimate 64-bit*
• Windows 7 Professional 64-bit*
• Windows 7 Professional 32-bit*
• Windows 8 Pro 64-bit
• Windows 8 Simplified Chinese Edition 64-bit
• Windows 8 Pro Downgrade to Windows 7 Professional 32-bit
• Windows 8 Pro Downgrade to Windows 7 Professional 64-bit
• HP Installer Kit for Linux (includes drivers for 64-bit OS versions of RHEL 5 & 6 and SUSE Linux Enterprise Desktop 11
• Red Hat Enterprise Linux Desktop (Preinstall NOT available; 1 year paper license only)

Supported:

• Genuine Windows® 7 Enterprise 32/64
• SUSE Linux Enterprise Desktop 11
• Windows® XP Professional 32/64 (on select configurations)*

Notes: *See the "Windows XP Support Matrix for Z Workstations" at:http://www.hp.com/support/workstation_manuals

Notes: For detailed OS/hardware support information for Linux, see:http://www.hp.com/support/linux_hardware_matrix

¹The specifications shown in this column represent the following: (all core maximum turbo steps, one core maximum turbo steps). Turbo boost stepping occurs in 100MHz increments. Processors that do not have turbo functionality are denoted as N/A.

NOTE: Z620 systems configured with E5-1600 series processors may not add a 2nd processor. To support two processors, E5-2600 series processor must be chosen.

When ordering two processors, the second processor must be the same as the first. Intel processor numbers are not a measurement of higher performance. Processor numbers differentiate features within each processor family, not across different processor families. See:http://www.intel.com/products/processor_number/ for details

Multi-Core technologies are designed to improve performance of multithreaded software products and hardware-aware multitasking operating systems and may require appropriate operating system software for full benefits; check with software provider to determine suitability; Not all customers or software applications will necessarily benefit from use of these technologies.

64-bit computing on Intel® 64 architecture requires a computer system with a processor, chipset, BIOS, operating system, device drivers, and applications enabled for Intel® 64 architecture. Processor will not operate (including 32-bit operation) without an Intel® 64 architecture-enabled BIOS. Performance will vary depending on your hardware and software configurations. See:http://www.intel.com/info/em64t for more information.

• Intel® Sandy Bridge Architecture
• Intel® C602 Chipset
• Intel® Xeon® processor E5-2600 product family 
  Intel® Xeon® processor E5-1600 product family
  (Sandy Bridge, Socket R)
• Up to 8.0GT/s QPI support with two QPI links between processors
• 4-channel per processor 1066/1333/1600 MHz DDR3 memory* subsystem
• Up to 192 GB Memory capacity with 12 DIMM slots and 16 GB DIMMs (with two processors installed)
• PCI Express I/O and dual PCIe x16 Gen3 graphics support
• Dual Integrated Intel Gigabit LAN on Motherboard (LOM)
• 2 channels of Serial ATA (SATA) 6.0 Gb/s and 8 channels of SATA 3.0 Gb/s natively supported internally
• SATA RAID** 0, 1, 5, and 10 support standard on motherboard
• SAS RAID 0, 1, and 10 supported using the LSI 9212-4i 6Gb/s controller
• SATA optical drives
• High Definition integrated audio with internal speaker
• 800W 90% efficient power supply
• ENERGY STAR® qualification and energy-saving features available on selected configurations (Not supported by Linux)
• Protected by HP Services, including a 3 years parts, 3 years labor, and 3 years onsite service (3/3/3) standard warranty. Terms and conditions vary by country. Certain restrictions and exclusions apply.

*Each processor supports up to 4 channels of DDR3 memory. To realize full performance at least 1 DIMM must be inserted into each channel. To get full 8 channel support, 2 processors MUST be installed.
**SATA hardware RAID is not supported on Linux systems. The Linux kernel, with built-in software RAID, provides excellent functionality and performance. It is a good alternative to hardware-based RAID. Please visithttp://h20000.www2.hp.com/bc/docs/support/SupportManual/c00060684/c00060684.pdf for RAID capabilities with Linux.

Slot 1 (top):
PCI Express Gen2 x4(1)*
Full-height, Half-length
(not available when 2nd CPU/Memory Module is installed)

Slot 2:
PCI Express Gen3 x16
Full-height, Full-length (with extender)

Slot 3:
PCI Express Gen2 x8(4)* with open-ended connector**
Full-height, Full-length (with extender)

Slot 4:
PCI Express Gen3 x8 with open-ended connector**
Full-height, Full-length (with extender)

Slot 5:
PCI Express Gen3 x16
Full-height, Full-length (with extender)

Slot 6:
PCI 32bit/33MHz
Full-height, Full-length (with extender)

* x<number> = number of lanes or size of the physical/mechanical connector.
(number) = number of lanes supported electrically. Typically communicated as x# mechanical, x(#)electrical.
** open-ended connector allow a greater bandwidth (e.g. x16) card to be installed physically into a lower bandwidth connector/slot.

2 USB 3.0, 1 USB 2.0, 1 Headphone, 1 Microphone, 1 IEEE 1394a

Tool-free 800W 90% Efficient wide-ranging, active Power Factor Correction
The Power Supply Efficiency Report for this product may be found at this link: TBD