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HP Z400 Workstation - System board architecture

This section describes the workstation system architecture.

The following figures show the typical system board block diagram for 4–DIMM and 6–DIMM Z400 workstations.

4–DIMM system board block diagram


The x1, x4, x8, and x16 designators describe the mechanical length of the slot. The number in parentheses lists the number of electrical PCIe lanes routed to the expansion slot. For example, x16(8) means that the expansion slot is mechanically a x16 length connector, with eight PCIe lanes connected.

6–DIMM system board block diagram


Processor technology

This workstation uses the Intel® X58 Express chipset to support the latest Quad Core Intel® Xeon™ processor W3500 Series, including processors up to 130W. These processors incorporate an integrated 3-channel memory controller, microarchitecture improvements and large L3 cache to provide superior performance. In addition, the workstation uses Intel QuickPath Interconnect (QPI) to connect the processor and I/O controller with speeds up to 6.4 GT/s.

Memory technology

The workstation dual in-line memory modules (DIMMs) are based on DDR3 1333MHz technology, and are error checking and correcting (ECC)-protected. Three direct attach memory channels permit low latency accesses and fast data transfer for improved performance. The workstation supports system memory sizes of up to 16GB (in the 4-DIMM Z400s, using 4-GB DIMMs) and 24 GB (in the 6-DIMM Z400s, using 4-GB DIMMs).

DIMMs should be distributed across all three memory channels for optimal performance.


The workstation supports PCIe Gen2 (PCIe2) bus speeds and can support dual PCIe Gen2 graphics cards in PCIe2 x16 slots. It supports graphics cards up to 150W in the primary graphics slot. If the primary graphics card consumes less than 150W, a second graphics card may be supported in the second PCIe2 x16 slot, subject to the overall 150W power system limitations.

Expansion card slots

The workstation implements one Intel X58 I/O chip to provide a total of six high-performance graphics and I/O slots. In addition to the two full x16 PCIe Gen2 slots, two additional PCIe x8 (4) slots (x8 mechanically, x4 electrically) provide extra I/O bandwidth for high speed I/O cards. Open ended PCIe x8 connectors let the user install x16 physical size cards in the x8 (4) slots.

Additional features

Redundant array of independent disks (RAID) configurations for SATA support modes 0, 1, 5 and 10. eSATA (3.0 Gbps) is supported using an optional adapter. The workstation provides 8 external and 4 internal USB 2.0 ports. The 475W power supply is 85% efficient and enables Energy Star Version 5.0 system configurations. HP WattSaver technology enables support of the European Union ERP Lot 6 power limit of 1W in off mode. HP Quiet Fan Technology enables quiet system operation. A plug-in card supports Serial Attached SCSI (SAS) drives.

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