Memory Technologies; I/O Technologies; Pci Express Technology - HP BL680c - ProLiant - G5 Configuration

Technologies in hp proliant g5 c-class server blades

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Figure 9. Diagram showing how the processor installation tool simplifies installation

Memory technologies

Depending on the model, HP ProLiant c-Class G5 Server Blades support the following memory

technologies:

• Registered PC2 (DDR2) DIMMs

• Fully buffered PC2 (DDR2) DIMMs

DDR2 memory devices operate at 1.8V. DDR2 devices use high clock frequencies to increase data

transfer rates and on-die termination control to improve signal quality. For example, at a clock

frequency of 400 MHz, the data transfer rate is 800 megatransfers per second (MT/s), which

translates to a memory bandwidth of 6400 MB/s per DIMM. Single-rank registered DDR2 DIMMs

place only one load per DIMM on the memory bus. Fully buffered DIMMs implement a serial

architecture to increase memory bandwidth and capacity.

HP ProLiant c-Class Server Blades support PCI Express (PCIe), serial attached SCSI (SAS), serial ATA

(SATA) I/O technologies, Multifunction 1 Gb or 10 Gb Ethernet, 4 Gb Fibre Channel, and 4X DDR

(20 Gb) InfiniBand.

The PCI Express (PCIe) serial interface provides point-to-point connections between the chipset I/O

controller hub and I/O devices. Each PCIe serial link consists of one or more dual-simplex lanes. Each

lane contains a send pair and a receive pair to transmit data at the signaling rate in both directions

simultaneously (Figure 10). ProLiant G5 server blades support PCIe 1.0 slots, which have a signaling

rate of 2.5 Gb/s per direction per lane. After accounting for 20 percent serializing/deserializing

encoding overhead, the resulting effective maximum bandwidth is 2 Gb/s (250 MB/s) per direction

per lane. Therefore, a x4 link with 4 send and receive pairs has an effective bandwidth of 2 GB/s. A

For additional information, refer to the HP technology brief titled "Memory technology evolution: an overview of

system memory technologies"

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00256987/c00256987.pdf.

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