HP Xw9400 HP xw9400 Workstation - Service and Technical Reference Guide - Page 21

NOTE: If a graphics card requiring more than 75W is installed in Slot 2, HP recommends not using slot 3, which is the PCI slot below the graphics slot. If a graphics card requiring more than 75W is installed in slot 5, HP recommends not using slot 6, which is the PCI-X 100 slot below the graphics slot. In addition to these slot power specifications, the overall power consumption of the system (including I/O cards, processors, memory, and drives) must not exceed the maximum ratings of the system power supply. Also, there are broad restrictions on using dual 150W graphics cards. For hardware specifications of other system components, such as graphics cards or optical drives, see the website of the specific manufacturer. Chipkill support Chipkill is a form of advanced Error Checking and Correcting (ECC) computer memory technology. The HP xw9400 Workstation supports 128-bit Chipkill ECC memory functionality. Standard ECC functionality detects and corrects single bit data errors in memory systems. But Chipkill offers greater memory error protection by providing error correction for up to 4-bit errors within the same symbol (nibble boundary). Chipkill cannot correct any random four bits across 128 bits. Chipkill on the xw9400 functions within these parameters: ● The workstation enables Chipkill functionality on paired ECC memory DIMMs only. ● The use of single memory DIMM-not supported on the xw9400 workstation-allows standard single bit ECC only. ● Chipkill can detect and correct up to four bit errors if the four bits are in the same symbol. That is, multiple bit errors in bits 0-3 or 4-7 of a byte can be detected and corrected. Multi-bit error that overlap or span symbol boundaries (bits 2-5 or 3-6, for example) cannot be corrected. For DIMMs that are based on x4 parts, this means that a single DRAM chip can fail and the system will continue to operate. For x8 and x16 parts, a complete DRAM chip cannot fail, but symbol errors will be corrected as described. ENERGY STAR Qualification HP computers marked with the ENERGY STAR logo are compliant with the applicable U.S. Environmental Protection Agency (EPA) ENERGY STAR specifications for computers. The EPA ENERGY STAR logo does not imply endorsement by the EPA. As an ENERGY STAR Partner, HewlettPackard Company has determined the products marked with the ENERGY STAR logo are ENERGY STAR qualified per the applicable ENERGY STAR guidelines for energy efficiency. The following logo appears on all ENERGY STAR qualified computers. The ENERGY STAR Computers Program was created by the EPA to promote energy efficiency and reduce air pollution through more energy-efficient equipment in homes, offices, and factories. One way products achieve this energy efficiency is by reducing power consumption when not being used through the Microsoft Windows Power Management feature. The Power Management feature enables the workstation to enter a low-power (or "sleep") mode after a period of inactivity. When used with an external monitor that is ENERGY STAR qualified, this feature also supports the similar power management features of the external monitor. ENWW Chipkill support 11