HP ProLiant Intel-based 100-series G6 servers

1200W 48VDC up to 90% efficiency Climate Savers Silver

Use the HP Power Advisor to help determine which power supplies will best meet your needs:

http://

h71028.www7.hp.com/enterprise/cache/600307-0-0-0-121.html.

Redundant power operation

In supported ProLiant 100-series G6 servers, redundant power supplies operate in “Balanced” mode,

where power is drawn equally from both power supplies. This mode ensures full redundancy but can

result in higher power consumption when power supplies are operating with reduced loads and lower

power efficiency.

Voltage regulation

Voltage regulators c

onvert the 12V DC supplied from the server power supply into a variety of lower

voltages used by the different system components. HP has developed higher peak efficiency voltage

regulators that maintain greater than 90% efficiency over a broad range of power requirements. The

net result is about an 8% gain in DC power efficiency, which results in almost a 10% efficiency gain

in AC input power.

These efficiency gains come with no loss in performance and require no configuration by the user.

Improved thermal sensors and fan control

HP has added additional thermal sensors throughout the ProLiant 100-series G6 servers. The 100-

series G6 servers have “zoned” fans that increase cooling and energy efficiencies in the server by

adjusting cooling when called for by the sensors in that zone. Fan curve mapping firmware uses

temperatures reported by the sensors to control cooling fans in each zone. Fan speed is based on the

highest temperature readings reported by any of the sensors in a given fan zone.

Phase shedding

Beginning with G6 servers, HP incorporated phase shedding into voltage regulators. Modern digital

voltage regulators deliver DC power at the proper voltage to components by using up to five different

phases of high-speed power pulses that charge capacitors. Each phase delivers its power pulses in a

rotating time window with the other phases in the voltage regulator such that the power pulses from

one phase do not overlap with those of another. The width of each pulse determines the total power

delivered by the particular phase.

Phase shedding enables the system BIOS to turn off one or more of the power phases if it determines

that the power requirements are less than the full amount of power from the voltage regulator. This

reduction in phases decreases the maximum power that the voltage regulator can deliver and

increases overall efficiency.

Memory phase shedding

Xeon 550

0 and 5600 Series processors support memory phase shedding. Memory phase shedding

operates much the same way as processor-based phase shedding. At power-up, the ROM BIOS

determines the number of phases needed for the memory voltage regulator based on the number of

DIMMs installed. Memory phase shedding can save up to 2.5 W per DIMM socket. This feature is

more effective on servers whose DIMM sockets are not fully populated since fewer phases are

required to accommodate such a configuration. Fewer phases mean less power consumption.